Portable systems aren't just for your workday commutes. I like to play my GBA on my lunch break at work, on the can when it's time for #2, and even a little bit in bed after I've tucked myself in for the night.
The more I read about the DS, the more promising it looks.
i can agree with that. i play my gba when i head up to my cabin in the woods, its much easier to lug it around than unplugging a computer or a ps2 and lugging it up there and plug it back in then pack it back up to bring it home.