Well, a PDA might be your best bet for these reasons:
A) The lowest cost Palm PDA is $99, a darn good PDA (I have one and love it) and cheaper than a Nintendo DS (~$130 - have one of these too, with Chessmaster DS).
B) You can be "using" (e.g. playing chess) your PDA during meetings and no one will be the wiser. Just tell 'em you're taking notes. Can't do that with a DS.
C) You will have more functionality with a Palm Chess program, then with a Nintendo DS (e.g. ability to export and import PGNs, based the type of program you buy).
D) There is a really good FREE chess program for the Palm here. It can export your games to PGN to the built in Notepad application. Hotsync with your PC and you now have the PGN in .txt format on your PC, free to import it into anything else for study. Programs for the DS (there are two that have chess, Chessmaster DS and Clubhouse Games) are about $30ish each.
E) Like I mentioned, I have both the DS and the Palm -- please contact me if you have any questions.
I have a free cell phone from work and it is not a smartphone. I don't need a smartphone. I also don't really need a PDA.
But I would love to have a pocket chess program to play while waiting for the bus, sitting on the loo, sitting in boring meetings...
What would people recommend? Keep in mind that I'm a ~1200 player, so I don't need something very strong overall.
I guess my options would be either a dedicated pocket chess computer like Excalibur, etc. makes, or some kind of PDA + software, though 90% of the PDA would be wasted in the sense that I'd only be using it to play chess.
A nice feature would be to ship PGN files to/from the device, so I could analyze my games...