Try marketleap.com. Pretty good tool.

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Russell Volk, REALTOR®
Mid-Atlantic Real Estate
Feasterville, PA
Bucks County Real Estate | Bucks County MLS | Bucks County Homes.

Try http://www.keywordenvy.com they are free and have nice graphs and stats.

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---cK

CK Chung is an independent SEO consultant who provides premium Holistic SEO services, including services specific to Real Estate SEO. You can find his alter-ego, Kid Disco, spouting off on his SEO blog at SEOdisco.

I use WebCEO and it works beautifully. Like seoservices, I track hundreds of sites, each with lots of keywords.

It's not cheap, but I think that it's worth it.

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The Real Estate Biz