According to this article from MacWorld
http://www.macworld.com/article/143167/2009/10/gmail_phishing.html

Tens of thousands of Comcast, Gmail and Windows Live (Hotmail) accounts were hacked into exposing passwords.

If you have not changed your password in the last 60 to 90 days, and you use one of these services, please do so now.   You should be changing your password every 2 to 3 months as a measure of precaution.

You’ll need to log into web mail to change your password, even if you don’t use it to check your account regularly.

http://www.comcast.net
http://www.gmail.com (Go to Settings)
http://mail.live.com (Hotmail)  (Go to options more options)