One area I find interesting is classification. E.g. I'm building a search engine for lectures, so I built a utility that classifies search terms based on whether they are for a speaker or not, based on the text of the term on Wikipedia.

The next stage will be to take articles posted to the various programming language subreddits, and build a classifier that classifies articles by language or topic. I did this previously for talks based on heuristics, but this will allow for a lot more categories: https://www.findlectures.com/?p=1&class1=Technology&category...