I got a new ipod touch for xmas and heres a couple doodles on the app Brushes (better ones to come as i get used to it), i also got a stylus to draw with.
Compared to a nintendo ds with Colors, the ipod feels better, and has a better screen, the program has better controls (like undo) and way more zoom, the only downsides are; no pressure sensitivity, and the stylus feels weird at first (the tip is like a round sponge, whereas the ds feels like a pen tip) plus the ds has dual screens which is great for details while seeing the whole image. Also Brushes cost me $2.99 (really thats nothing for a program, but on the ds everything is free with a flashcard :), but this has the bonus that the dude is consistently updating his program as he now can make a couple dollars from it, and in 3 days i got an update that fixed some issues, and with free updates thats awesome.
Personally I prefer the ipod with brushes over the ds even without pressure, the colour and feel is just better, and the brush selection is better. I also just got Flipbook on the ipod, so next up will be some little animations, and man its an awesome pocket animation program, its a million times better then animanatee on ds (which still rocked) but flipbook was $9.99, so a little more cost be def worth it.
Finally to all you DS diehards who are also super techno fans (im lookin at you Garman) GET KORG, its a drummachine/synthesizer program on ds that you can make awesome techno and music with (sold officially a ebgames if you dont download)
