Early, I try to both steal the pot and/or build the pot before the flop by betting up to 5 BBs. The way I see it is you've got 100 BBs, so why not risk 5% of your stack? Being the pre-flop aggressor gives you an advantage when the flop comes and, if you had callers, you've got a nice little pot you can try to win/bluff/out-play for.
In the middle of the tournament I fold these up to about 55 if anyone raises. In the middle of the tournament you're trying to survive and you won't do that very long hoping for trips all the time.
Late in the tournament (i.e. in the money) I play them very aggressively before the final table. I want chips and I'm willing to sacrifice 1 or 2 money levels to do it. Afterall, when your money levels are going from $2.50 to $2.75 after 9 players get knocked out, you've already made the $2.50 and your goal shouldn't be another .25 cents, it should be to hit the final table.