And there are many more besides!
Pinging weblog servers is a good idea as it ensures fresh content from your blog is always available to them; this in turn can help generate more traffic to your blog. An easy way to ping several servers at once is to use a pinging service, such as Pingoat or Ping-o-Matic. You simply input the name, URL and RSS feed (optional) of your blog and these free services do all the hard work for you! You can even bookmark the page for an automatic ping each time you load it.
Much easier than visiting a dozen websites each time you update, or waiting for ages for your blog to publish and ping!