When you write a new post there is an option on your admin panel (Admin -> Options -> Writing -> Update Services) where you can enter ping sites who will be notified when you make a post and will list your post on blog directories on the internet.
I came across a list of ping sites, I have not checked them all but even if half of them work then that means more publicity for your blog.
If you have come across anymore then please let me know via the comments section and I will happily add them.
http://api.feedster.com/ping
http://api.moreover.com/ping
http://api.my.yahoo.com/rss/ping
http://blogsearch.google.com/ping/RPC2
http://ping.amagle.com/
http://ping.bitacoras.com
http://ping.blo.gs/
http://ping.feedburner.com
http://ping.rootblog.com/rpc.php
http://ping.syndic8.com/xmlrpc.php
http://ping.weblogalot.com/rpc.php
http://rcs.datashed.net/RPC2/
http://rpc.blogbuzzmachine.com/RPC2
http://rpc.blogrolling.com/pinger/
http://rpc.icerocket.com:10080/
http://rpc.newsgator.com/
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://topicexchange.com/RPC2
http://www.blogdigger.com/RPC2
http://www.blogoole.com/ping/
http://www.blogoon.net/ping/
http://www.blogsnow.com/ping
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://www.lasermemory.com/lsrpc/
http://www.newsisfree.com/RPCCloud
http://www.popdex.com/addsite.php
http://www.snipsnap.org/RPC2
http://www.wasalive.com/ping/
http://www.weblogues.com/RPC/
http://www.blogsdominicanos.com/ping/
http://www.xianguo.com/xmlrpc/ping.php
http://www.feedsky.com/api/RPC2
http://rpc.pingomatic.com/
http://pingoat.com/goat/RPC2/
http://pingqueue.com/rpc/
http://www.bloglines.com/ping
http://1470.net/api/ping
http://add.yahoo.com/fast/help/us/my/cgi_rss_submission
http://api.moreover.com/RPC2
http://api.my.yahoo.com/RPC2
http://bblog.com/ping.php
http://bitacoras.net/ping
http://blawg.org/modules.php?name=Web_Links&l_op=AddLink
http://blog.goo.ne.jp/XMLRPC
http://blogbib.com/submit.php
http://blogdb.jp/xmlrpc
http://blogdigger.com/add.jsp
http://blogintro.com/?page_id=925
http://bloglines.com/register
http://blogmatcher.com/u.php
http://blogs.botw.org/helpcenter/submitblog.aspx
http://blogsforsmallbusiness.com/directory/add.html
http://boingboing.net/suggest.html
http://bulkfeeds.net/app/add
http://bulkfeeds.net/rpc
http://chordata.geckotribe.com/suggest.php
http://coreblog.org/ping/
http://dir.nooked.com/submit.dir?action=Start
http://directory.google.com/Top/Computers/Internet/On_the_Web/Weblogs/
http://dmoz.org/
http://feeds2read.net/Suggest-A-Feed
http://feedshot.com/
http://findingblog.com/add_blog.php?cat=
http://geekphilosopher.com/MainPage/gpBlogLinkAdd.php
http://gnoos.com.au/submitFeed.jsp
http://gob.phaeba.net/register.php
http://mod-pubsub.org/kn_apps/blogchatt
http://myst-technology.com/mysmartchannels/sign-up
http://ngoid.sourceforge.net/sub_rss.php
http://ping.blogg.de/
http://ping.bloggers.jp/rpc/
http://ping.blogmura.jp/rpc/
http://ping.cocolog-nifty.com/xmlrpc
http://ping.exblog.jp/xmlrpc
http://ping.myblog.jp
http://ping.weblogs.se/
http://pinger.blogflux.com/rpc/
http://pingomatic.com/
http://portal.eatonweb.com/add.php
http://pub41.bravenet.com/freelink/add.php?usernum=3492821172
http://reader.rocketinfo.com/desktop/AddRSSFeed.jsp
http://rpc.britblog.com/
http://rpc.tailrank.com/feedburner/RPC2
http://rpc.wpkeys.com/
http://scienceport.org/index.php?show=add&PID=
http://services.newsgator.com/ngws/xmlrpcping.aspx
http://signup.alerts.msn.com/alerts-PREP/submitPingExtended.doz
http://smallbusiness.com/wiki/Weblog_directory_company_blogs
http://strategicboard.com/?s=h:addblog
http://trackback.bakeinu.jp/bakeping.php
http://w.moreover.com/cgi-local/site/sourcesubmission.pl
http://weblogs.about.com/library/nosearch/blsubmit.htm
http://www.2rss.com/index.php
http://www.5starblogs.com/Add_blog
http://www.a2b.cc/setloc/bp.a2b
http://www.all-blogs.net/submit.php
http://www.anse.de/rdfticker/addchannel.php
http://www.answers.com/main/new_blogger.jsp
http://www.bitacoles.net/ping.php
http://www.blogadvance.com/signup.php
http://www.blogarama.com/add-a-site/
http://www.blogbib.com/submit.php
http://www.blogbunch.com/suggest/
http://www.blogcatalog.com/blogs/submit_blog.html
http://www.blogcode.com/signup.php
http://www.blogdigger.com/add.jsp
http://www.blogdir.com/dir/formreg.php
http://www.blog-directory-submit.com/RSS/l_op=Addrss.html
http://www.blogflux.com/add.php
http://www.bloggernity.com/cgi-bin/add.cgi
http://www.bloghop.com/account/index.htm?BH=437115b4c51f5a6bf533f674f17ea06e
http://www.bloghub.com/cgi-bin/add.cgi
http://www.blogion.com/?p=submit
http://www.bloglisting.com/addablog.html
http://www.blogmighty.com/link_submit.php
http://www.blogmopolis.com/submit.php
http://www.blogoriffic.com/add_blog.php
http://www.blogpeople.net/servlet/weblogUpdates
http://www.blogpulse.com/submit.html
http://www.blogrankings.com/addblog.php
http://www.blogroots.com/tb_populi.blog?id=1
http://www.blogscholar.com/index.php?option=com_registration&task=register
http://www.blog-search.com/blog-submission.html
http://www.blogshares.com/rpc.php
http://www.blogsoldiers.com/links/links.php
http://www.blogsweet.com/suggest_link.php
http://www.blogtopsites.com/register.php
http://www.blogtree.com/
http://www.bloguniverse.com/radlinks/
http://www.blog-watch.com/add-url.php
http://www.blogwise.com/submit
http://www.bloogz.com/man_en/add_your_url.php
http://www.blurtit.com/
http://www.bulletize.com/add.php?sid=0
http://www.bulletize.com/index.php
http://www.canadiantechmob.com/form.php
http://www.contentsmatter.com/add.php
http://www.crayon.net/using/suggest.html
http://www.csthota.com/blogmap/submit.aspx
http://www.diarist.net/
http://www.esperanto.se/kiosk/engindex.html
http://www.everyfeed.com/addsite.php
http://www.feed24.com/?c=add
http://www.feedage.com/submit.php
http://www.feedbomb.com/
http://www.feedboy.com/
http://www.feedcat.net/addfeed1.php?lng=en
http://www.feed-directory.com/addfeed
http://www.feedmap.net/BlogMap/submit.aspx
http://www.feedminer.com/addfeed.aspx
http://www.feeds4all.com/AddRSS.aspx
http://www.feeds4all.nl/AddRSS.aspx
http://www.feedsfarm.com/a.html
http://www.findory.com/submit-blog/
http://www.findrss.net/A55711/rsscatalog.nsf/submit?openForm
http://www.flookie.net/
http://www.fybersearch.com/add-url.php
http://www.getblogs.com/
http://www.globeofblogs.com/register.php
http://www.google.com/webmasters/add.html
http://www.headlinespot.com/site/suggest.htm
http://www.holycowdude.com/rpc/ping/
http://www.iblogbusiness.com/add.html
http://www.icerocket.com/c?p=addblog
http://www.imblogs.net/ping/
http://www.industry-blogs.com/submit.php
http://www.jordomedia.com/RSS/l_op=Addrss.html
http://www.lsblogs.com/howtosubmit.php
http://www.mod-pubsub.org/kn_apps/blogchatter/ping.php
http://www.news-feeds.org/addfeed.php
http://www.newsgator.com/ngs/subscriber/Folksonomy.aspx
http://www.newsisfree.com/xmlrpctest.php
http://www.newsmob.com/register/register.php
http://www.newzalert.com/AuthorCenter/
http://www.octora.com/add_rss.php
http://www.plazoo.com/addrss.asp
http://www.plazoo.com/en/addrss.asp
http://www.postami.com/rss.finder/submit_feed.php
http://www.pressradar.com/suggest
http://www.pubsub.com/add_feed.php
http://www.rateitall.com/s-4679-blog-directory.aspx
http://www.rateitall.com/suggest.aspx?WL=0&TopicID=20004
http://www.readablog.com/AddFeed.aspx
http://www.redtram.com/pages/addsource/
http://www.rss-clipping.com/
http://www.rssfeeds.com/suggest_wizzard.php
http://www.rssmad.com/
http://www.rss-network.com/submitrss.php
http://www.sarthak.net/blogz/add.php
http://www.search4rss.com
http://www.shas3.com/submit/
http://www.sphere.com/feedback
http://www.syndic8.com/suggest_start.php
http://www.tailrank.com/import
http://www.technorati.com/ping.html
http://www.thefeeddirectory.com/p/Add-A-Feed___255.html
http://www.thevital.net/
http://www.topix.net/member/register
http://www.truthlaidbear.com/addtoscan.php
http://www.weblogalot.com/Ping/
http://www.wilsdomain.com/add-url.html
http://www.wilsdomain.com/blogs/wilsdomain9b.php?op=newsubmit
http://www.yourwebloghere.com/add_url.php
http://www.zhuaxia.com/rpc/server.php
http://xmlrpc.blogg.de
http://xping.pubsub.com/ping/
https://phobos.apple.com/WebObjects/MZFinance.woa/wa/pingPodcast
https://www.gobignetwork.com/blog/AddBlog.aspx