I knew this thing had been coming for ages so I had one Imported from japan on launch day. I must say im very impressed. I never noticed any problem with battery life, often managing a solid 8+ hrs on 1 full charge, although once the red lights comes on you really have to save your game the turn it off cos the battery will die very soon after that.
One of the most important parts of choosin to buy one is of course games and Nintendo had a sorry lookin line up 4 the launch of this. Having said that the games coming out for it look amazing the best being Metroid Hunters, Yoshis Touch & go, Mario 64 DS, Viewtiful joe, animal crossing and of course mario kart DS.
the DS also comes internet ready from the box and palm and microsoft have recently had patents registered by nintendo for their palm OS and MSN messenger meaning this could also be a perfect organiser!