I have been using Trulia to research houses for sale in my area. It is generally pretty good, but the information can be pretty outdated, so be careful if you really fall in love with a place to double-check with your agent that it's actually still available. Although the site itself is kind of meh, the trulia app is pretty awesome. It's really easy and intuitive to use (I've been using it on a tablet). You can just move around a map and homes for sale will pop up in the area, you can tap a home to see the pictures, split the screen between maps and descriptions, etc... It's really fund to use, just realize that the information may be pretty old (as in days, which in real-estate time is an eternity).