So what's a desperate gamer to do? Easy, just hook your Xbox up to your PC and tether it to your 3G phone. Killthrash over at 2old2play has posted a handy guide to connecting to Xbox Live using a laptop and a Blackberry Bold on AT&T's 3G network. It takes some work and it's not as smooth as a dedicated connection -- and will probably destroy your data plan -- but gamers do what they have to do, right?
Now, if someone can make this happen with a Mac too, then everyone wins.