Googling is typically great for research, but for the area of grants, I think Matthew Lesko's books have a corner on the market for a one stop source for grants.
Check your local library for these titles:
http://www.amazon.com/s/ref=br_ss_hs...0&Go.y=8&Go=Go
I'm pretty sure he updates these every year, so you can also find older used editions online for pretty cheap.
I have yet to find a website that does as well as his books to put so much in one place.