Hey Tom, they are all running 12.4(13a) Enterprise right now. 32MB flash/128 MB ram on all of them. The Enterprise image fills the flash to within 900 bytes! I can get you whatever version you want. Technically licensing is up to you beyond the base IP image (which comes with any Cisco device) but I've never heard of Cisco busting a home lab.
My 3725s are in the rack so the 3640s will be on Ebay on Monday. Let me know if you want me to hold onto any of them.
