Well, they're almost certainly collectable, does it have the box? That would be cool.
There's some nice stuff you can do with it, Stick MS-DOS on it and use it to edit text files, or run WordPerfect 5.1 on it for example. The keyboard on the early machines used a similar mechanism to the Mega ST (It's a Mega ST box with a 5.25 drive, for cryin' out loud) so it will be really comfy to type on! http://www.atari-history.com/computers/pccomputers/pc-1.html
