Zillow has released an iPhone app for real estate searching on-the-go. All of the same data available on Zillow is available on the app. Zillow uses Microsoft virtual earth for its mapping.
"Researching homes and house-hunting is inherently a mobile experience," said Rich Barton, Zillow co-founder and CEO. "The GPS-enabled iPhone untethers our Zillow users from their computers and puts the power of our database of 88 million homes in their hands when they need it most - while they are looking at homes."
Here are screenshots of the app:
(Listing for my dream house here in Raleigh.)