I'm beginning to think that some other writers on the Mac beat are reading my mind.
About two weeks ago, one of my consulting clients was asking if there was any way that she'd be able to upgrade to Snow Leopard and still be able to run two legacy applications in Classic, one of which was HyperCard. Being the forward-looking guy I am, I suggested that we just move the data from her old HyperCard stack over to Bento (simple), and then see if we could find a replacement for the other application into which her employees could re-enter the old data.
Yesterday I was looking at posts over on the venerable Mac website TidBITS, and blogger/author Matt Neuburg had written a post about SheepShaver. This oddly-named application is a PowerPC Mac emulator, one of several that are available for both Mac and Windows. Neuburg does a good job of explaining the process of getting a ROM image, then using a Mac OS 9 installer CD to get SheepShaver up and running.
Matt pointed out a website, E-Maculation, that is dedicated to Mac emulators and how to get them up and running. While my client loved the solution I was able to provide to her, running Classic under Snow Leopard might be a better (and more fun!) solution for other Mac users. If you're up to the challenge and fun of setting up SheepShaver on a Snow Leopard Mac, be sure to take a look at both Matt's post and the E-Maculation website.
In the meantime, I'm going to go put my aluminum foil hat to make sure that Matt stops reading my mind.