This.
Another thing that gets to me is trying to check my credit card balance on the Bank of America "Mobile Site". The only number it will show me is the sum of the transactions that have cleared - it's impossible to see my "available credit" (or the information necessary to figure it out) which is probably the only thing I would ever care about on the mobile site.
Of course my completely unscientific tests seem to indicate that the standard, non-mobile site is significantly faster than the mobile one on my N1 in any case... So I'm stuck using that atrocity instead.
Oh, and don't forget Bank of America's Android/iPhone apps, which, last I checked, were just WebViews around their website.