We have a couple Rebel G's and a Rebel 2000 that we check out to students. The auto focus is out on one of the G's, but that does not decrease its usefulness. The students like them. Their assignments usually require manual controls, so most of our cameras are capable of manual control. We have a Rebel GII that I bought off someone, but the shutter button falls of -- the negative side of plastics. I'll use it if one of the other Rebel bodies dies -- the students will just have to keep a piece of tape over the shutter button!
We also have a Minolta X-700, a couple Pentax ME-Supers, a Pentax ZX-M, and a few Nikons (EM - auto, FE, FG, N2000, a F2 somewhere. We also have a F3 that stays in my desk drawer for students I can trust with it -- especially after our then-new FM3a disappeared for awhile and finally came back damaged a few years back.
A couple Rolleicords, a Fuji 6x7, a studio Fuji 6x8, a Kiev, and a large assortment of 4x5 cameras round out what I have for the students to use. (Oh, and an 8x10 of mine I sometimes let someone use.)
And boxes of dead cameras that we can't afford to have fixed -- several Pentax K-1000's with non-operating meters, for example, and the FM3a, a few Nikkormats, etc. I should take a course in camera repair!