Real Estate, hands down. The MLS should be more open.
Openness of the MLS lies in the hands of the Agents, and they should be demanding free and open access to their listing data so they can sell more properties, but they just stick the the status quo.
Here's how it works. Agents PAY their local MLS's to take THEIR DATA, then the MLS charges THEM to be able to take it back and use it.
It's the most absurd system I've ever seen.