Ask HN: Opportunities for Structured Data?

Ever since Google acquired ITA and Metaweb, I've been thinking of other verticals where building / aggregating structured data would be valuable. Seems like many niches have already been covered:

- Lawyers: Avvo

- Doctors: Vitals

- Location: Yelp/Foursquare/etc

- Cars: Vast

- Pets: Vast

- Movies: Imdb

- Credit Cards: NerdWallet

I think it would be interesting to brainstorm some other verticals where building your own structured data could be a viable business.

Here are some that I'm thinking about:

- Colleges: It's a pain comparing which college is better vs another. Having a single structured database/model for all colleges would be great. Could extend it to comparing courses/costs/future salaries/etc.

- Disease: There are some companies already doing this, but I feel like it could be more open. Symptoms, cures, timelines, progression, location, etc.

- Soft Goods: Clothes, accessories, etc. Not sure how you'd go about creating / gathering enough structured data, but seems like there is a need.

What do you think are some good opportunities to apply the structured data biz model?