I remember that game, it was so much fun. I'm sad to say I don't know of a port to the Mac for it though. (I still have the SimTower disk somewhere on my desk though)
I've just done a bit of digging and found a shot of simtower running is OS9, but am yet to find any way of getting it to run in OSX. I've found the free downloads for the Windows version, though.
You can probably just run sim tower in crossover, Not positive though you would need to test it. And sim tower was one of the best games back in the day, kinda want to play it now hehe.
Yeah I've got a Powerbook G4 that has irregular start up patterns. It's got Tiger - do I still need to get OX9 or does 10.4 have an OS9 Compatibility mode?
Edit: Just realised when I click on 'simtower' or the picture relating to it, nothing happens, a blank page loads. Dohh!