Quite old actually, now... been out, what, at least a year, and I've a suspicion somewhat longer. Its got some pretty cool hardware at its disposal (a 400MHz chip in addition to a 3D accellerator for starters), and iirc has a built in GPS and possibly a phone as well (not sure). Certainly had a feature of being trackable by parents if they wanted to know where their kids were. Also had the option of buying a version that (get this) you had to stop playing every half hour or so so they could show you an advert - although to be fair, that version was a LOT cheaper (and rightly so).
Unfortunately - or fortunately, depending on your point of view - the small screen, horribly hard to break into DRM system made it bad for homebrewing, and the PSP and DS have fairly firmly established themselves as king and queen of the hill for portable commercial 3D stuff.