I've been working on a Realty Broker (common in Boston) idea for the past couple of months. I'd say the problem of finding people isn't that difficult really. I've built a list of 75+ companies including their contact info, website, location, etc. My next step is to go down the list and essentially cold call them. My plan is to ask what software they're currently using (if any); whether it meets all their needs -- if not, what are they looking for; etc. If anything, I hope to at least help a couple of them get a website up and running and start from there.