I am thinking of donating my perfect condition 20D with it's modest non IS 18-55 kit lens. What is it worth these days? It certainly still makes great pictures, and was serviced last year by Canon.
For tax purposes, you can claim about $200-300 with the lens. If you were selling it on Craigslist, You'd probably get no more than $200 depending on how good a salesman you are.
It would be a excellent gift for a school.