Since all of you apparently want to bicker over $4/month, I'll put in some real requests:
1. Cross-game Clans
2. Dedicated host servers alongside peer servers, allowing games to go for the "epic battle" on XBL, like PSN does with Warhawk, Resistance, etc.
3. More media content... Get more movies and shows up there, MS.
4. A better player review system. The current one doesn't work.
Or check out my new webcomic: http://selfcentent.com/