Sure its not a mac, but it IS PPC (has a 100MHz 604 in it). I picked it up Saturday from a church yardsale for $35, and that included the machine, original monitor, keyboard, mouse, a 16port multiplexer, an 8port multiplexer, a 4port multiplexer (same as the 8 port sans expansion board) two 16 port Remote Async Nodes (pretty much the same as the muxs afaik, but with direct enet ports instead of RS232), an IBM 3151 keyboard, and 3 Videx OmniWands, like the scanners a UPS guy uses, and 4 DSU capable modems. Plus more ethernet and serial cables imaginable.

The RS/6000s specs are as follows: 100MHz 604, 80MB RAM, 2.1GB SCSI HDD, 4x SCSI CD-ROM, SCSI DAT drive (I've disconnected it since, no use for it). It boots to an AIX 4 login screen for which I have no login, but I'm working on getting it to boot off my AIX 4.1.4 CD.

Here's high and low res pictures of my little setup