I use Sportacular, too, and really like it. Nice simple and fast interface to get scores and stats.
I also look at Yahoo since I also have live scoring, but the pages take pretty long to load over Edge (I haven't moved to the 3G iPhone yet).
Also, rtsports has a beautifully spartan mobile page which is fine over Edge. I'm only in 1 rtsports league, but it's nice to be able to see the scores quickly in that one.
Meanwhile, I usually get like zero Edge reception at the Meadowlands where I watch all the Jets home games, and that's frustrating. But I'm usually preoccupied there with tailgating and, you know, actual live football