REBOL and TCL are languages which go at least as far as Clojure in data-centric programming. Both feature incredibly elegant DSL for a variety of tasks, like constructing parsers or defining GUIs. Personally, I don't have an opinion on whether they (including Clojure) take it too far, but it's true that even that culture is not unique to Clojure :)
I don't know about REBOL, but I did program TCL extensively in my graduate school years. I agree TCL has a lot of similarity in term of treating code as data like in Lisp, but I do not think it has such an emphasis on data oriented programming like in Clojure. That's just not true.
It might not be immediately clear, but the "data oriented programming" discussed in this subthread is about using code as data to be interpreted. That TCL has way less primitive data structures and even less syntax for them doesn't mean it doesn't treat a lot of the code as data. REBOL[1] and Red, on the other hand, do have a comparable collection of data structures along with literal syntax for them.
