Poker

It is truly amazing how ESPN single-handedly created (recreated) the poker craze in recent years by televising the World Series of Poker. Judging by the fact that you can now purchase a set of poker chips from your local drugstore, eBay, or the closest Target, it's safe to assume that the popularity of the game is still on the rise.
On a related note, with the passage of the Unlawful Internet Gambling Enforcement Act of 2006, the fate of once-prevalent online gambling in the United States is unclear. Gambling online against strangers is not nearly as fun or exciting as playing in person with your buddies, anyways. Or, you and your buddies can always head to the nearest riverboat or Indian reservation casino, or Vegas, if you must get on the table. If/When you do, here's a random strategy for Limit Texas Hold'em:

After the flop, if (1) you are on a straight draw or a flush draw, (2) someone bets before you, AND (3) you are the last to act:
you should re-raise that bet.
Reasoning: assuming other players just call your bet, when/after the turn card is shown, they are likely to just check to you. At this point, if you've made the flush or straight, you can bet, or slow play it if it is the nuts. On the other hand, if you haven't made your straight or flush, you can just check, essentially getting to see the river without having to pay anything else.
Example: on a 3-6 limit table:
you have A-h and 10-h
the flop: Q-h, 7-h, and 3-c
two players in front of you, the second player bets ($3)
you should re-raise ($3 + $3)
the turn: 4-d
you have not made your flush, and the two players in front of you, assuming they merely called your re-raise in the previous round, are more likely than not just going to check

this is not complete, i'll finish it later, email me if it doesn't make sense and if you're interested.