Thanks Schmoburger, that was a good in depth answer!  I am going through all of the old Macs at my workplace, and we are getting rid of the stockpile of ones we are unlikely to use again.  We will be keeping anything IIsi or IIci, and all our beige G3s.  I am planning on getting rid of the Performas and all PowerMac 7100 and 7200 units.  I really don't need them for anything. I hope to be listing them on the trading post forum during the next month.  Thanks!