The other day I was checking out the Google serps for a whole bunch of market areas - through a proxy server rather than my own connection. I was astonished to find that the serps all had Google Base real estate listings in the number one spot - which I do not see if I search Google through my regular internet connection.
This leads me to believe that perhaps more people are seeing the Google Base listings than I previously thought. (It also could be siphoning off search engine traffic that would account for a reduction in clicks for sites in the serps even if positioned in the top 10.)
If the listings are in the number #1 spot it is probably worthwhile having your listings included.
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