I Haven't wanted to stick with the stock user interface since the minute i heard about rooting and themeing, but once i wiped fresh and installed the newest Froyo build FRG22 (Download HERE) I was in love with my stock (looking) phone again. Overclocking is super smooth, no force closes, no hangups, no weirdness anywhere.
The best part is that as far as i could tell, Flash worked just fine. I watched a couple cartoons and played a few games to test it.
I heard something about the big fix in FRG22 was the window transitions and app switching got smoothed out. I would have bet all my money on that being a MAJOR fix even if i didn't hear about it.
THIS BUILD IS AWESOME!!!!!
REMEMBER TO DOWNLOAD IT HERE!!!!! (THANKS WUYANKS FOR THE LINK TO THE POST!)