first up, i enjoy the carbon theme on 360 personally and was wonderingif there is interest from the mc360 team to do carbon or glass themes, even if they come later after the initial release of the skin. if not, its still the best skin i've ever seen. it's amazing what passionate people will do without pay and you should definitely be commended for it!
second question. i'm under the impression the gamertag is for xlink kai. for those of us that don't use kai, would you consider making an option in settings that would allow users to enter their XBLive gamertag, and program MC360 to obtain the gamerpic, gamerscore, and rep from xbox.com or other gamercard sites.