Yeah, that's pretty cool. I ran Lifeforce as a demo at several talks last year, it was very convincing. (Although, frankly, running retail DVD-ROM games on day of beta or release is an even more convincing feat if we can pull it off.)
As somebody else pointed out, there are already appdb entries for quite a few demos: http://appdb.winehq.org/objectManager.php?sClass=category&iId=95 It'd be nice if someone filled in any missing ones there.
(I'm not sure how much overlap there is between demos and real games, but the idea of a really small graphical app is appealing, one would expect they'd be easier to diagnose?) - Dan