I was wondering similarly: Dev work on ST2 seems to have stopped altogether. Which is a pity, because it really was shaping up to be a winner. But there are still plenty of features missing.
Now i'm using chocolatapp, which seems to be moving along briskly and now has a better feature set.
I'm not sure... TM1 actually has some pretty rough edges which don't seem to snag in actual use. It's the only non 'mac-like' app that I've ever grown to love.