It's in beta. I plan to get Gmail when it comes out publicly, but before then, there's a charity that gives Gmail invites to troops that I'd give whatever invites I got to.
I heard about it on WilWheaton.com, a blog by a minor actor which I found through a link on Fark.com, where I lurk regularly. (Never post there, though.)
Holy crap! I like the pic where your sig is. Did you make it yourself?
-Boo
No, unfortunately I cannot take credit for either of those. Just right click on any of them, then at the bottom of the box that comes up it should say "Properties." Click on that and it has the website that I got them from.
EDIT: If you want to add them to your signature, you have to put an at the beginning of the web address and an [/ img] at the end of it, without the spaces.