Awesome, thanks for the responses guys
I also tried some scummVM games on my friend's DS, which I thought worked well if not a little slow/choppy (and alas no talkie versions of the games).
I was thinking of getting something like this:
http://h10010.www1.hp.com/wwpc/us/en...5-1847962.html
Just for the coolness factor, but judging from hunt's post it might work decently for adventure games as well! Especially when I'm commuting in the train / bus.