Clojure 1.2 is now available.
You can download it from:
In case you have missed out on Clojure then all you really need to know is that its a recent dynamic language targeting the Java Virtual Machine (JVM) and its main rival at the moment is probably Scala which also targets the JVM and occupies roughly the same space. Clojure is, very roughly speaking, an easy-to-use dialect of Lisp with dynamic typing.
Version 1.0 was only released in mid 2009 and so we are looking at a very young langauge.
This decimal point upgrade includes many new features, such as protocols and datatypes; enhancements to existing features like the sequence library, destructuring and agents; support for annotations, etc.
In addition, it incorporates many enhancements first developed and nurtured in clojure-contrib, like I/O, string and pretty printing facilities.
More detailed information: http://clojure.org/