I find myself preferring d20 for campaign games. Obviously, there's D&D, but d20 CoC has replaced the BRP version for my uses. Plus, I still really, really want to play Omega World and Spelljammer: Shadow of the Spider Moon. Most of my homegrown games or upcoming game designs are d20, primarily because I like the core system and find it easy to modify to my needs.
That said, I find for one shots or pick-up games I'll play almost anything. I want to try Exalted and Dying Earth, plus I'm always up for running Warhammer Fantasy Roleplay or playing Shadowrun. And I really need to get a Lord of the Rings game going.
I guess my game playing habits have stayed pretty much the same: I primarily play D&D and dabble in other games once in a while. Even 10 years ago, I ran D&D campaigns and played or ran the occasional Ars Magica, Shadowrun, Warhammer FRP, or Mechwarrior game. OTOH, I've been buying a lot more RPG stuff since every month I can find at least one cool, useful d20 book on the shelves. Before d20, I could go two or three weeks without finding an RPG book I wanted or needed.