I'm excited about tomorrow too. I used to be vexed by the price and sort of still am, but I sved up for this for the last few months, so I can buy a 3DS and a few games right off the bat. Still, it's going to be a big outlay of money. Oh well, at least I'll be entertained for a while :-)
The games I'm picking up tomorrow are Super Street Fighter IV 3D, PilotWings Resort and Ghost Recon Shadow Wars. There are a few more I'm interested in but will have to wait on until I can save more money, like the Res Evil game and Steel Diver.
The battery doesn't bother me much either. 5 hours is a lot as long as you remember to keep recharging when you are done. The only thing I could think of where the life would be too short would be a road trip or a long flight, or maybe if you are camping for a few days or something.