Short-handed Strategy

Good Hands: With top pair good kicker, or better hands, I like to bet out to build a pot. I will not slow down on the turn or river until my opponents tell me to (by raising back at me).

Pocket Pairs: Play it like a marginal hand if your your PP can beat mid pair, muck it otherwise. Play it like a good hand if your pocket pair hits a set, or is higher than the board.

Flush Draws and Open Ended Straight Draws: You want as many people in the pot as possible. If the table is loose with many people calling to the river with crap, bet out to build the pot. If the table is fairly tight, check with the intention of calling when the button bets, to try and get more callers. If the player after you bets, and people call afterwards, when it's your turn, RAISE. You have nothing now, but no one is going to fold for one more bet. Maximize the pot you can win by raising.

Gutshots: Call if you're getting odds, otherwise fold.
Overcards: These are a bastard to play early position, being you cannot use the freecard and free showdown plays. Needless to say, if the board is very ragged, I will try for a check raise, and bet out on the turn, and hope they fold. If the check raise fails, and the turn doesn't help, then well you're screwed Razz. Depending on your reads you may choose to bet out, or check fold. If the board is coordinated, I will check/fold, knowing there's too many ways I can be beat.

Backdoor Draws: Not worth playing if this is the only thing you have.
Multiple combination of the above.
Again, consider the board, consider the players, and do what maximizes the pot size and your ability to win it. Check raise marginal hands, bet out strong hands and draws, and reraise for value to build big pots.
Assuming at least 3 handed...
FLOP PLAY MIDDLE POSITION
Bad Hands: Lowest pair isn't best too often, you can muck these hands. Being sandwiched should give you more than enough reason to fold this. Marginal Hands: Hitting a marginal hand in middle position is very difficult to play. Here's the problem. You have a marginal hand, so you must protect it by betting. But when you bet, the players after you (1 or 2) can raise! If they raise, you cannot fold because if you fold too much everyone will take extra shots at you. And of course, they have position on you on the turn. If you just check, well the button can also check and you've given them a free look at the river. About the only good thing that could happen is if someone before you bet, allowing you to raise. They are usually betting to build a pot, perhaps on a draw. Destroy their drawing odds by thinning the field.

FLOP PLAY LATE POSITION
Bad Hands: If it's checked to you, bet if there's a high chance everyone will fold. Take the free card.
Marginal Hands: If it's checked to you, bet it. You may have the best hand you may not. Bet to find out. If someone before you bets, raise it to drive other people out. They will often check to you on the turn. You will then have a choice between the free card or free showdown. I prefer the free showdown for 2 reasons. One, betting the flop and turn gives your opponents 2 chances to fold. Also, the free showdown prevents a check raise on the river. But of course, if you think your hand is best, value bet.

Draws: Bet and try to build pots. If someone early bets, and there are 2 or 3 callers, you want to raise your flush and OESD. Your raise is for value, you have a huge chance of winning the pot. Juice it up while you can!

Weak Draws: I like to bet these when it's checked to me, usually for the free card. This applies for gutshots and overcards, although I'll do the free showdown with overcards rather than the free card.
Now if you've read my early position advice, you'll see that being on the button you can be check raised. Fortunately at the lower limits the only people capable of making this play are good players, or stupid players. Find out which type of player they are and adjust accordingly. Unless you have absolutely nothing, call if it's 1 small bet back to you. Then you can fold the turn if you don't improve.

FLOP PLAY IN THE BLINDS

Playing the blinds well is one of the most difficult skills to master. This is one of the more profound differences between longhanded and shorthanded play. The blinds come around twice as fast, and people will take shots at your blinds. You cannot let them bully you around. In other positions you are usually fine because you are playing premium hands anyway. Even if everyone just calls, you have 96o in the blinds, and the flop comes 249, it's hard to know where you are.

In that situation, you can bet out to test the waters. But if someone has A9, they may call it, or raise it. If they raise it you can muck, knowing you're in deep shit. If they call it, you're in deep shit too, because there are a lot of passive players who will call like this. You'll likely end up paying them off if they don't raise.

Going for the check raise is alright too, but most of the time you'll just scare the button into thinking they're in deep shit, and they'll just call down the turn and river bets, and flip over T9.

Playing blinds is difficult because there is no way you can "buy" the button. If you bought it that means everyone folded Very Happy. Thus, the blinds are really only profitable when you have monsters.

You are expected to lose money in the blinds, you just need to minimize it as much as possible. Be aggressive with marginal holdings. I like to stick with my mantra..."if they don't raise, I have the better hand."