I have not done the post card thing but would like to do so minus the outrageous pricing. I don't personally sign many people up, but I do have several pages ranked on different sites for "city home value" or "values" and I post a fairly detailed explaination of market statistics for my market place and at the end use a call to action of get regular updayes of this weeks local market conditions for your neighborhood. Then link to one of those pages with an explaination of what you get and a iframe of the text widget. In addition to this I also put the sidebar website widgets in a number of my WordPress blogs.

I have had a number of instances where I had someone call me or email me saying that a friend has a report and they were real impressed, to the point of wanting one of their own.

I also use my IDX and market snapshot to help start conversations with people. If I recieve an IDX registration I see if I can spark conversation by offering the market snapshot. If I get a registration thanks to the market snapshot I offer access to the IDX to try and start a conversation.

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