A blog by Reg Braithwaite (raganwald) hosted on github. It is voluminous and focused on code. There’s not much on Clojure, but it definitely focuses on functional programming. I especially recommend the posts inspired by To Mock a Mockingbird. For instance: Kestrels.
The definitive time library in Java. If you have to deal with times, use Joda Time. It handles leap years, daylight savings time, and stuff you have never heard of. Add [joda-time “2.1”] to your dependencies for the latest version. There is a Clojure wrapper that depends on a slightly older version (1.6). Add [clj-time “0.3.7”] to use clj-time.
Bret Victor is a prolific “purveyor of impossible dreams”. Victor explains his principles by showcasing a small fraction of his work. He focuses on “reducing abstraction and indirection” in computing. Also check out his site, especially Magic Ink.
A static analysis library to refactor Clojure code into a more idiomatic form. I guess you could call it a linter. It uses lists of forms to pattern match your code and suggest improvements. Check out this sample: