How about
this for "Q" author ideas? It's a link to the Sony Reader store, because that's my go-to store, but it should give you some other names to search elsewhere, if you want. There are 341 names in that list; you can even narrow it down by subject, if you want.
As far as the challenge, I didn't want to limit what books I read -- that is, avoiding long books so that my goal would be reached -- so I was one of the "manage it however you want to" people.
I signed up so that I would be accountable for the books I read and my "real" goal was "more than 65". I am surprised because I have read more than 70 books now and still have a couple of months to go -- I won't make 100, but if I make 80, I will be very impressed with myself!