Tax Assesed Value

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ok so i just came upon a website that i thought was useful to me to asses the value of a property. oviously the best way to find out the value is the neighboring properties and thier recent sell price. so, i began searching properties and came upon zillow.com.

and although, i was wowwed by the "big brother" widget, i must ask what is the difference between "tax asseed value" as it states in zillow, vs. and the value of a property or are they the same thing? was a little confused by that term.

any help would be awesome. also, if anyone knows another website like zillow.com and is free, by all means share!
yours truly,
keuminotti