Interesting iPhone Application

Trulia just released a new application, that will allow the user to get open homes and open house information on their iPhone. Check out the video demo. It looks interesting.

Being that I just purchased a BlackBerry phone, I have found e-mail and data on the fly is a very powerful tool. I wonder how many home seekers will use this new Trulia application? At first glance this appears to be a great tool for Sunday open house searchers. It would be great to turn your phone on and have all of the open house data in your vicinity. One question I have is, does this service have all the MLS listed homes on it? If not, how soon until your local MLS designs a copy cat service?