Pinging is a way of letting RSS feed aggregators and Blog directories know that your Blog has new content added. In theory, the more often you Ping your Blog, the better your Blog will do in directories and search engines. Take note though that some sites have rules on how many times you can have your blog pingged in a set amount of time.
So how do I ping my blog?
You can use PingMyBlog or my personal favorite Ping-o-Matic.com either one are simple to use. Just enter your Blog information, check off all the boxes, and click "Submit Pings." You will receive a confirmation that your Blog was pingged by each of the sites you checked off.
It’s fast, easy and well worth it.
There’s also a PHP Blog Pingger that you can download but I haven’t had time to check it out yet. It’s called Blogpingger
The following sites will also let you ping your blog:
Posted by Mel of Ballyhoo Virtual Services