I'm currently installing and configuring Windows 98 under Virtual PC 6 on my Mac G4 Powerbook, so that I can play Twinsen's Odyssey again. And also its prequel, Relentless.
I don't know why I'm doing this, entirely — Odyssey was a great game with a groundbreaking engine for its time, but it was also a rather frustrating exertion at times; there are parts of the game that I'm almost certain I won't be able to pass. It is a hard game, for the most part.
Still, the attempt may well be the reward in and of itself, and certainly there are some enjoyable parts to the game. And as I've never played the prequel to Odyssey, Relentless, the whole experience should be doubly enjoyable.
Or, you know, incredibly frustrating.
Anyhow, Virtual PC isn't exactly a speed demon (although the game is old enough that one doesn't need huge amounts of horsepower to run it well), but it's a darn sight better than DOSBox for this sort of application, and I actually don't have any problems with using it. It's a tad odd to see Windows running on what is obviously an older Macintosh computer (not one of those sweet new Core 2 rigs), but hey...for some games, it's worth it.