How did you get it to work? I've been getting the "quit unexpectedly" error that many people are getting. I have the new Aluminum 24" iMac with Leopard 10.5.4. Did you have to do anything special? I'd rather not mess around with rolling back my video drivers. Even when I try to hold down the option key while launching the game to select open GL, the game still quits unexpectedly a second after I click on it.
Yours has an Nvidia video card - Diablo 2 is currently not working with Nvidia cards, works great with ATI cards.