We used to play once a week when I was in high school. We played pretty much every variant of poker (7 card, holdem, anaconda, low in the hole, roll your own, etc). Usually $10-15 buy in with 7-8 people, it was fun.
I still play holdem with some "new" people I met, but that's pretty much all they play. Similar buy in, tourny rules.
I've played a couple of times at the casino, real low limits like 2/4, it's not bad.
My friend (one of the guys from high school that started the poker thing amongst us) played for a living for a couple of years. Either on partypoker or at Foxwoods, he averaged about $60k a year.