So my gf is looking for a new flat. While helping her, I stumbled across this interface, which is...awesome. It is a value multiplier - by integrating geographical and price interfaces, it slashes the transaction costs of using multiple interfaces and creates massive gains.
Now, the interesting bit is imagine this as a local search service you could access from a mobile device. Then imagine hooks to that built into dumb objects - Semacode style. Many, many, many possibilities begin to emerge. Highly recommended.