A relative of mine believed his assessment was way too high on his land, so he built up a nice case of notes as to why it was overvalued, went in to meet with the county assessment board while dressed nicely with a shirt and tie, and got $3,600 whacked off his property taxes.
The Board was just very gracious and thankful for the presentation, and his not walking in with a battle axe to grind with them.
With home values declining very rapidly, I believe a lot of folks will be making cases that the fair market value of their property is assessed much too high.
It won't work everytime, but the more victories that we can pile up, the better.