Dell's non-extended battery has the most power of all the subnotebooks thus far. Drive space is skimpy and there aren't any extended batteries for sale yet, so points have been docked on that. Build quality is pretty good.
Plus, it'll be using Ubuntu as of October and that should increase battery performance. I tried to get the Aspire One on sale at Best Buy, but the entire region is sold out. Totally disappointing. Oh well.