Hmm. I've got a pile of 775dual-VSTA boards that I bought to resell at the flea, I could donate one or two of them to the cause. They take C2D chips. There seems to be modded BIOSes that might allow them to take certain 45nm chips, or perhaps that's limited to the 4coredual-SATA boards, I don't know. No onboard video, but they take PCI, AGP, and PCI-E video cards.
I've got two P4 rigs, 2.8Ghz S478, ASUS micro-ATX i865G mobo, and a Celeron 2.13Ghz S478, and another ASUS mobo. No ram for them, but they do have onboard video. I'm probably going to sell one of them to the neighbor, she said she "needs a new tower". Just waiting for her to put the money together.
I've also got a S939 NV6150 micro-ATX mobo that has severe DPC latency issues (mouse freezes briefly), that I'm going to be getting rid of and replacing with a second-gen AMD 780G board. I've got a 939dual-VSTA and 939dual-SATA2 mobo, and a DFI NF4 Ultima, and a S939 3200+, 3800+ (single core), and an Opteron 165. I also have 3 x 1GB DDR PC3200 DIMMs. I'm toying with keeping the Opty 165 and the DFI NF4 board (320FSB), and two of the 1GB DDR PC3200, just for old times sake, but I really don't need another rig. (I currently have two C2D E2140 @ 3.2Ghz, and I'm building two Q6600 quad-core monsters.) I wouldn't mind donating the remaining S939 stuff.
Edit: I have a few PSUs laying around too. One's a 350W CodeGen that was pulled from a working system, slightly dusty. That would be a fine PSU for an Athlon XP rig. I've got some other cheapo ones, I think a Logisys 500W and an HEC 585W, brand new. I've got some other nicer ones too, but I think I'd want some $$$ to part with them. ThermalTake 500W, CoolerMaster 500W, Earthwatts 380W. I think I still have a 450W Xion PSU (low-end) too, NIB.