We (me 'n' my bro) got a new Gamertag a couple days ago for our birthday.
http://live.xbox.com/en-US/default.aspxSh4k3rW1ll
My brother picked it (1337 is there because that's all I got to do to it).
I've never gotten my own gamertag. My brother got "Shakerwill" on Xbox LIVE Original, and my stepdad got two for Xbox LIVE 360.
So, yeah, I never get my own anything. =P
And I think EVERYONE with Xbox LIVE (360) Gamertags should link to their profiles in their Sigs. I'm about to....
*logs off and plays Halo 3*