Updating your ping list could be a good way for you to get more traffic to your blog and more backlinks for free.
When you write a new blog post and publish it, wordpress automatically pings http://rpc.pingomatic.com/
thus notifying it of a new blog post. If you update your ping list to include the following services. more sites and people will be aware of your new blog post and now you potentially have a better chance of getting more people to visit your blog
http://rpc.pingomatic.com
http://ping.bitacoras.com
http://bulkfeeds.net/rpc
http://blogsearch.google.com/ping/RPC2
http://www.blogpeople.net/servlet/weblogUpdates
http://ping.myblog.jp
http://bblog.com/ping.php
http://ping.bloggers.jp/rpc/
To update the list go to your wordpress admin section and then go to options / writing
you will see update services at the bottom of the page, copy and paste the above list there.