SBA SizeUp - Benchmarking Tool
Private Research Firms - You may need to try them out to see what best meets your needs or stop in and get information as needed.
Compete - A blog you might enjoy
comScore - Useful information in their blog
eMarketer - sign up for free newsletter and blog
Housing Assistance Council - Rural Data Portal
Marketing Charts - B2B - Sign up for newsletter
Research Brief from MediaPost Blogs - Helpful newsletter