PolicyMap offers over 4,000 different indicators covering demographics, economics, housing and mortgage information, crime and other neighborhood level datasets.  There is a free registration option that gets you access to a great deal of the functionality offered on the site.  If you need access to current year or 5-year projected data then the site offers a subscription-based service.

PolicyMap was developed by Placebase (developers of PushPin) in conjunction with The Reinvestment Fund.  View the demo for more about PolicyMap.