If your Xbox is more than just a game console to you and you’re into the whole “player community” thing then 360 Live app might really be what you need.
It’s basically an app that lets you connect to the Xbox live system and :
-Sign in securely using your Xbox Live credentials. 360 Live automatically retrieves your friends.
-Complete Gamertags management. Add, remove, accept or reject pending requests.
-An organized Friends List. Grouped by status (Online, Offline, etc.)
-Gamer Profile and details including gamerscore, bio, location, country, gamercard, avatar, etc.
-Check your friends complete games history.
-Compare locked and unlocked achievements per game and gamertag.
-Send and receive messages. You can even send messages to multiple recipients!
-Gamercard coverflow style carrousel on landscape mode!
It’s not the only Xbox live app available but apparently this one is from far the most featured one.
Isn’t it funny that what is probably the best Xbox companion is an Apple device?