I've been using my Nintendo DS Lite quite a bit recently, as evidenced by the fact that my right shoulder button completely wore out.
That button is used primarily as Tetris's "save/use piece" function -- which, incidently, I've been using with much more frequency and much less "Tetris Purist" guilt -- to power slide in Mario Kart DS, and to aim your gun in Resident Evil DS. (Incidentally, the Resident Evil folk get mad props for naming this port/remake "Deadly Silence," thus making the requisite "DS" Nintendo puts at the end of every game title actually useful.)
In any case, I use my right shoulder button an awful lot, so I've just taken advantage of Nintendo's warranty feature to get it repaired. In the meantime, I've been playing a little with the non-Lite "Phat" DS that's still laying around, and it has really thrown me off my game.
We spent a couple hours yesterday driving around trying to find a pink DS Lite for me to play with until mine gets back from Nintendo D to have, since she's not terribly thrilled with the Phat either. No such luck though :(
There've been lots of black ones, a few white ones and no pink ones. If I was a betting man, I'd have wagered that the black would be the most popular. I guess I would have lost.
UPDATE: 4-10 days for return shipping info to arrive, 3 days to repair, then 4-10 days to ship it back to me? I'm not sure I can make it...