I came home today, and found my mum trying to get an old pre-OSX game to work on our mac running Snow Leopard. In preference to digging out one of our old macs, I thought it might be a good idea to try and find a classic OS emulator on the net. It didn't take long to find one, but having downloaded Sheepshaver, I couldn't get hold of a working ROM. I tried all the strategies suggested on the website, including trying to extract the ROM from an update, but to no avail. Having given up on that, I searched the web for sites with ROMs available for download. I eventually found one, but none of the ROMs worked. Finally, just as I was about to give up, I found a site which explained everything beautifully, and included a link to a working ROM. After following all the instructions, and finding everything worked perfectly, exactly as described in the article, I decided to post this post to make it that much easier for other people to find the page. So, after all that, here's the link.
Hopefully you'll be up and running a lot faster than I was.