Welcome to XBA, enjoy your stay.
Points of interest include:
If you feel like sharing the epic reasoning behind your Gamer Tag, feel free to visit this thread, there are some interesting reads there I might add:
http://xboxamerica.com/threads/Whats-behind-YOUR-Gamertag/page/1
Meta's Ultra Waffle Thread, for the easy 1000 games
http://xboxamerica.com/threads/Metas-Ultra-Waffle-List-10xp/page/1
Xbox America Trade In Center, for games you don't want anymore
http://xboxamerica.com/threads/Xbox-America-Trade-In-Center
Waffle Order 2.0 after your blue in Trade Thread, for games you just want to pass around the community. A waffle is what we call an easy 1000 game.
http://xboxamerica.com/threads/Waffle-Order-20/page/1
And if your down for some straight up tournament style competition, check out the XBA Monthly Tournaments thread.
http://xboxamerica.com/threads/XBA-Monthly-Tournaments/page/1
There are also the weekly Gamerscore Competitions, and multiple lists in the threads, like the Game Completion List and such.
And the Events for any game you may want to play, or make an Event for.