RefHeap
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Just saying, doing the equivalent of Pygments for the 10 most important languages (your call which) and having an end-to-end Clojure solution might be a more impressive calling card than being the first Clojure web app to wrap Pygments.
Responding to edits:
I agree, there'd certainly be a bigger coolness factor to that. However, we're trying to build a useful site here for anyone who wants to use it. Pygments is mature and does what we need and a whole lot more.
I'm a fan of Pygments (it's kind of a secret weapon; we don't just use it it to syntax highlight), but that also means I'm acutely aware of how straightforward a syntax highlighting pasteboard is to build on top of it. For that matter, so is Github; Gist is powered by Pygments.
I'm really interested in Clojure (I'm kind of shopping for a next language, I like Lisp, and I'm pretty sure the next thing needs to be a JVM language), so maybe I'm just hoping to get people to make ambitious things I can look at.
On the other hand, I'm happy you're interested in Clojure! I'm sorry that our project might not be the one to put you over the edge on it, but I definitely hope something does. :)