I love the ACR .10c rebuys. Great place to learn, low stakes. And i've found myself at the final tables and first place more than I probably deserve. Built my bankroll up this way from $50 over the last 8 months or so, to $500 now!
I like the $.30/.03 or $.05/.05 bounty tournaments on ACR. By taking 2 or 3 or 4 players out you can reduce your entry fee cost to next to nothing or even make something without placing in the money. But in the final analysis, it is pretty much a waste of time.