Real Estate Data Sites

http://www.realestateabc.com/home-values/

http://www.birdseyesearch.com/
SUCKS!!! for the DC area

http://www.bogozo.com/
Integrates CraigsList, mostly rentals

http://www.zillow.com

http://www.mibazaar.com/realestate/
Ebay Listings with gmaps

http://www.eppraisal.com
Uses Microsoft Viewer, have to register for appraisals

http://www.trulia.com
gmaps with standard data like lost size and house size