This is a good idea, but maybe there's a way for you to display some data before signing up? Right now, there's nothing on the site at all except for the form requesting my information. After I submit it, there's a message there's not enough data for my address, and a request for email. At this point, it would be helpful to see what exactly I'm signing up for.
Maybe examples for different addresses, or average data per neighborhood? I recently was looking for a new apartment, and I found this very useful: http://www.tregny.com/manhattan_rental_market_report