All in all, SB2 looks great!
I wish, just like guesty said, you could toggle between HP percentages and x HP/max HP. That way, I won't have to whip out the calculator if, say, my Latias might get wiped out from LO recoil or SR damage.
Also, with the new 2v2 feature, I'm wondering what impact will it have on the site. There should be at least one entire section dedicated to doubles analyses and strategies, instead of just that one article.