I used to donate spare photography and darkroom items to the Perpich Art School (they're in Golden Valley). But schools often put a high priority on consistency (i.e. same type of enlarger, same type of developing tanks) as to make instruction easier. Anything "homemade" may be difficult to sell unless fairly esoteric.

There is an upcoming photo swap show (http://www.f-stopswap.com/) but I think it's a difficult venue to sell darkroom items. To augment Thomas' offer, I'd take lots of photos of the equipment and put up on Picassa (or equivalent) so you can point people with a link.

Chemicals, if still in sealed cans, might still be good though not necessarily in demand.

Occasionally, an item you might think is close to worthless can be of somewhat high value because it fills a particular niche.