A lot of this depends on whether you're playing cash games or tournaments.

Quote Originally Posted by AFchung
A lot of the time i find that I'm in the BB with a craptacular hand (K3, J5, 38 etc) and the SB will try to steal with a minimum raise. I rarely like to put in a bad chip into the pot (unless im the agressor) so I constantly fold, and will re-raise if i pick up a decent hand, and call his raise if i pick up a hand that has potential. Is this what I should be doing?
Nothing wrong with this at all. If stacks are very deep (say 50x BB or deeper), you can flat call with high potential hands such as pocket pairs and suited connectors to play for something nice on the flop, but with real trash folding is definitely the default option for me.

Quote Originally Posted by AFchung
What about heads up? Today I had to use the strategy above because he had a 3:1 chip advantage. I finallly picked up 99 and re-raised and he pushed me all in. I called and he flipped over AA. Probably just a cooler, but at least did i play the hand correctly?
This is just a cooler. Again, it depends on how deep stacks are, but in a typical SNG tournament where stacks are no deeper than 30x BB, it'd be a cold day in hell when I'd fold 99 in the spot you describe.