I'm loving it, but maybe it's just because I'm easily amused. Been playing around with the music playback functionality a lot. Having way too much fun speeding up, slowing down, or chipmunk-izing songs.
And the cameras are surprisingly decent. I think they're only VGA quality, but they work well for the system, and even the couple pictures I transferred to my computer were decent-looking. The built-in editing software is fun.
This stuff will probably get old after a little while, but I'm not regretting the upgrade from the DS Lite.
And with the deal, GameStop was giving $20 off GTA: Chinatown Wars. I've never been too big into the GTA games, but I've heard great things about this one so I've giving it a chance (at $15 I feel I at least owe it THAT much). I'll keep you all updated on that.
I downloaded Chinatown Wars and have been playing that lately. I like it a lot. The driving in the top down view takes some getting used to, but everything else is just about spot on.