The libraries I mentioned are all located in the Clojure GitHub group (https://github.com/clojure/). Actually, the Clojure community has thus far done a very good job of keeping the core language relatively small and implementing the "interesting" bits as libraries. (Personally, the idea that Go-style/CSP concurrency is a language feature of Go, but can be implemented as a library in Clojure is rather appealing to me.)

As these are Clojure-Core libraries, I'm fairly certain you'd need to submit a CA before you can submit a pull request (details here: http://clojure.org/contributing). Probably the biggest help you could provide in the near-term, though, would be to find interesting uses for these libraries.