You're right Sean, it is a great tool. Tax assessment info is of public record and anyone should be able to access this information, however since many counties still do not have their databases online, it may mean a trip downtown.
At least in this county, besides being able to download ownership, detailed appraisal, and sales information on the property, you can also download the properties county tax lot map, which every now and then I find useful. I only wish that this system wasn’t so picky about syntax, and I wish it knew that John and Jonathan Doe could be the same people. Dumb machines.