That's why the razr maxx is very appealing. They manage to fit a 3300ma, battery into a very slim phone that looks pretty nice. If only all oems started doing this
Not to mention, at the price that Android central is charging, you can get two 2100 mAh batteries for around the same as the 3500 mAh. Can have an extra 700 mAh of power.
Or just buy a bulky external, which is the route I went. 12,000 mAh for $80 seemed like a fair deal, and it essentially means that I can just burn through power on my phone and not worry about it.