When I hire I look for specific types of knowledge, not specific languages (even Lisp and Smalltalk, which are still on my resume). IMO it's really difficult to tell how much, or what, people know, by looking at standard resumes.

Just putting Clojure on a resume is meaningless--I can put anything I want on a resume. It's meaningless until you talk to the person and find out if they have the basic concepts of multiple paradigms down.

That said: having "interesting" tech on a resume means at least they know the words and they might be more likely to have a strong developer mind.