I’d been looking for something like this and just found it: http://cdndrips.blogspot.com/
Its basically a listing of all the Canadian DRiPs, along with the discount (sweet!) they offer for shares purchased through the DRiP.
Want to learn more about RESPs? Buy The Book:
The RESP Book: The Simple Guide to Registered Education Savings Plans
Everything you need to know about RESPs.