I’m always on the lookout for resources related to merit scholarship opportunities; here’s what I’ve got at the moment:
The SallieMae scholarship search engine is here: https://smscholarships.com/
A colleague in another school recommended The A’s and B’s of Academic Scholarship. (I haven’t read it yet, but it’s on my list.)
USNews’ list of colleges offering the most merit money is here.
Another site which lists scholarships with known criteria is guaranteed-scholarships.com
The bookmark I typically use for these kinds of resources is “scholarship”… you can see more of my tagged pages over here on del.icio.us.