There is a guy I know who approached me looking for copies of DOS 6.22 - he is way old school.
Anyway, I didn't have DOS, but I had an original copy of Windows 95 A spread across something like 17 floppies. I upped it, as we don't have anything that will run such an old os (drivers, baby - it's all about the drivers).
I also looked about and found two 1.2 gig hard drives (Boot-And-Nuked and formatted up for use) and a copy of Windows 98 SE (tried to install that on the old eMachine, but it wouldn't go). Upped them to the cause, and the guy was in hog heaven. I just love handing off old geekables to someone who is going to have a great time with them.