I discovered this web site over the weekend. I tried it on my own home and it seemed fairly accurate. But obviously you have to be your own judge. It has been going a little while, Zillow when it first launched was inaccurate and it has steadily got better, this might also have improved.
The site is http://www.rentometer.com/, just enter an address and a rental amount and it gives you a range of the lows and highs in the area and the median.
This would seem a useful site for landlords and renters as well. Hope it helps. If it is accurate for your area you may want to post a link on your web site.
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