My HoMM3 CD doesn't work anymore. I would like to buy a new copy so I can play it again though. I had a lot of fun with that game.
HoMM5 is pretty good as well, but it is much more difficult to create your own map (as I couldn't figure much of it out at least), and that was one of my favorite parts of HoMM3. The biggest reason I haven't reinstalled it lately, is that I don't want to have to deal with the DRM it was shipped with though. I would rather play the "safe" HoMM3 instead.