Dell suggests 4 hours of battery life, while Asus suggests 4 hours for their EEE PC with the Atom processor. On the other hand the EEE PC's have higher capacity batteries at 4400 mAH vs. Dell's 3200 mAH, which makes me wonder a bit about these battery life claims . . .
Dell wins hands down on price though, as the equivalent EEE PC seems to around $550-600. I haven't done a true side by side comparison, but the Mini seems pretty slick. Once I free up some cash, it may be my next purchase . . .