If you are out looking at property it is a must have. Open the app, do a local search and up pops a map of all property sales in the area, most with a small description of the property and a guide sale price. If you are looking at buying a unit in a block it can bring up the other sale prices in a snap. If you see a house you like you can check when it last sold and for how much.
I tried it out in my street and in no time a list of properties was available.
Best of all it's free and can be downloaded from here.
http://itunes.apple.com/au/app/id375054462
http://www.commbank.com.au/personal/home-loans/i-phone-app/default.aspx