1. Hold'em ring games, both limit and NL.
2. NL Hold'em sit-and-go tourneys.
3. Stud
4. Limit Omaha 8/B
5. MTTs
Hold'em pays the bills. I probably like to play stud the most. I find it interesting and challenging, but I don't make much money when I play it. Omaha makes me crazy; it's fun if you gamboooool it up but the bad beats are maddening. If you play it correctly it's twice as tight as Hold'em and boring as hell. I don't play many MTTs. Of course, I'd play in them more often if I didn't suck quite so much.
When I have time to learn new games I'll take up Stud 8/B and then PLO.
Are you asking because you're trying to gauge interest for that series of tournaments you mentioned in another post? If yes, then please offer a couple with games other than NL Hold'em for the sake of variety.