It is useful to have a Gmail address (Google's free Webmail service). 1 gigabyte storage is great.
»The only way you can get a Gmail account is by invitation. (Thanks Johnny!) For almost nine months, gmailswap.com provided a place for nice people to help nice people. Now Gmail Swap is closed, and says: "Google is tossing out invitations as if they were candy - if you're looking for one, chances are that one of your friends, or someone at another online community, can help you out."