Zillow is a pretty popular real estate search site and they just launched a mobile version of their site. It gives you access to public records and assessments for properties. It gives you information like square footage, rooms, and an estimated value. It will also show homes currently listed for sale and the asking price.
The main downside of the mobile version is that you cannot search a neighborhood or are since you can only pick up single listings. Check it out at mobile.zillow.com and let me know what you think!