It was perfect for Domino, consisting of a master database plus another database for each geographical area they roll out. We started with two areas, Austin and Houston.
If it ever takes off, which I think is unlikely at this point, the I'd just create a new database for each new area to be rolled out and they populate it with the property photos and info for that city.
At the moment I've got a part time gig that uses a third-party web based product for tracking the workflow. It isn't really very good, in my opinion. I think I can create a new and better web tracking system that will run rings around what they have.
Of course, once created I'd have to do some marketing and find some customers.
Having a product or a service that uses your IT experience but ISN'T about IT might give you a more dependable cash flow stream. At least that's what I'm thinking of for myself.