Bloggers need to update the Search Engines regularly to index the most recent content URLs. Going to each search engine & updating then separately is not a good option. Why not submit you blog at once & update all those popular & most used search engines in one click? Yes, Its possible using Ping-o-Matic.
Ping-o-Matic is a free service that updates different search engines that your blog has updated.
This site pings blog updates to 25+ different blog search engines including WeBlogs, Feedburner, Technorati, My Yahoo, BlogLines, News Gator, Google Blog Search etc
Just go to the site & enter your Blog name, Blog home page (URL) & RSS URL.
Select the services to ping & Click the Send Pings button. And its done.
I prefer to use a big list of ping service. Pigomatic is really goood and default ping service in wordpress.
Yes, WordPress Ping facility allows to update various feed services.
List of services to be pinged & updated for WordPress