Any Useful Info Found On Free Sites? (Zillow, Trulia,etc)

I am wondering if anyone is using any information from some of the free sites out there that seem to have a lot of data compiled for their short sales?

I noticed, www.Trulia.com has some interesting things where you can plug in address and it will tell you historical price, etc?

I know that a lot of this information is crap, but some of it has to be useful to us out there who do not have time to dig up all kinds of information regarding each property.

If anyone would like to share some of there information sources for short sale packages or for internal research only it would be appreciated!