i like yeah's list, but would add one more VERY important item:

1. the size of the stack of the guy trying to steal the blinds. if it's the big stack, about your only real defense is pushing all-in. so, if it's the big stack trying steal, choose your time to push back carefully, and expect to (and be comfortable with) getting called or reraised.

in an PP SNG a couple of days ago, through some good flops and really bad play by the other players, at 6 left, i was up to 4800, while everyone else was under 1000. in addition to constantly harrassing the blinds, if someone tried to bust back when i was blind stealing, and i had even a single face card, i would reraise and put them all-in. it was better than break-even profitable, and kept the other players on edge.

beware the big stack!