What are some well-written open source Clojure applications (not libraries)?

I'd like to look at some examples of well-architected, complete Clojure applications (not libraries, but completed applications that accomplish real-world tasks for end 开发者_运维问答users rather than for other developers.) Are there any such open source projects out there that are recommendable as examples of how to structure and write a user-facing application in Clojure?

Edit: I'd like to see a substantial full-blown application of some complexity as opposed to a prototype or a demo. Is there anything like that out there yet?

Lau Jensen has some idiomatic clojure source for a DB-backed reddit clone on github, which makes for interesting reading. Here's the corresponding blog post.