I notice there are several RE websites out there that offer home value comparison tools, or what your home is worth. Here's a couple samples:

http://www.owners.com/tools/comps/comp.asp
http://www.valuemyhouse.com/

I'm wondering if anyone has found a plugin, subscription, or server software that allows this type of technology to be inserted into an existing website?

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Irene Hartfield "The Webgoddess"
http://webgoddess.net
http://homesellersoregon.com