www.gmail.com for all the answers. or I guess I'll just answer.
It's basically hotmail or yahoo mail, except gmail. The biggest thing that makes it special is that you can have up to 1 gigabyte of data on your account at any given time. It also has a bunch of other handy features, like keeping email replys between you and another person all in one 'thread.'
Some people also think gmail is bit creepy (see
http://www.google-watch.org/gmail.html for details). I personally think it's mostly paranoid mumbo jumbo, with maybe a
little bit of truth. But hey, I got nothing to hide.
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Screw this I'm going skiing