Another nice thing about Gmail is the ability to use it as a POP3 server. You can simply configure outlook to pull the mail right off of it. You can do this with yahoo too, but they charge you money. With Gmail everything is free.
http://www.viksoe.dk/code/gmail.htm
It's a freebie and a warning; changes in gmail break it from time to time.
If you've no concern about what's on gmail it can be very handy, especially if you travel.