You want a time waster? www.zillow.com.
Type in an address, see a satellite image of said address, see tax info, sales in the last 7 yrs, sq footage, etc. Pretty cool 10 yr estimate of price changes, including a month to month assessment.
Some major limitations: Old photos, at least 1-2 yrs in some cases. No info if the house hasn't been sold recently.
This, combined with the Zip realty on a different site to compare "zestimates" with the asking price.
Enjoy.