Hacker News Reader

This is more a "spend the rest of the afternoon/evening/early morning getting horribly distracted" list of lists of lists, but I found a lot of it quite interesting, and I definitely have more ideas now than I had before I'd skimmed it:

http://reddit.com/r/datasets/top?t=all

The first 10M items (comments and stories) on HN: https://news.ycombinator.com/item?id=10002791

http://basekb.com/

Most interesting datasets/APIs?