My interests within the field is not what one would call narrow. Primarily though, I have a fondness for programming language theory, compilers, parsing and writing my own DSLs so that I can make powerful compile-time assertions regarding my code as well as generate tests automatically from the DSL itself.

My StackOverflow cv has an additional set of tasks that pertain to my interests, http://stackoverflow.com/cv/filipallberg.

Regarding my primary interests, the only relevant "thing" I have come up with is web-scraping, but I find it is a dull task as it is a trivial matter to me.

Machine vision is also something that I think a lot about, however most of my ideas are consumer-facing utilities and not something to build a business around. If I get a good idea I'd be willing to go into business myself.