Hmm, yeah...I remember reading about these back in the day. There were actually only two cards ever made for the Mezzanine slot - the GameWizard, and an UltraSCSI card some company made. Although its understandable, since Apple never said anything about the slot apart from "don't use it", it is a shame that nobody else developed anything for it...since the Mezzanine slot does provide access to the iMac's PCI bus, it would have been extremely neat if someone had developed a PCI expansion chassis for it.

You know, its funny to think....I remember back in 1998 I saw an original Voodoo1 card (the old-skool ones with the passthrough connector that piggybacked off the standard VGA card) in action on a PC for the very first time, and I remember thinking how amazing the graphics were. Despite that, Voodoo1 graphics look almost comical today.