Official Gmail Blog: 2 hidden ways to get more from your Gmail address

I recently discovered some little-known ways to use your Gmail address that can give you greater control over your inbox and save you some time and headache. When you choose a Gmail address, you actually get more than just "yourusername@gmail.com." Here are two different ways you can modify your Gmail address and still get your mail...
http://gmailblog.blogspot.com/2008/03/2-hidden-ways-to-get-more-from-your.html