I was waiting for a long time for PG to release Arc. Learning languages is easy but become productive with the libraries can take a long time (I come from Java and defected because I just couldn't keep up with all the APIs). So I chose Python before Arc became available and the "batteries included" approach has suited me well. Speaking of which, anyone care to mention how many "batteries" Arc comes with? I believe the Clojure took off as fast as it did because it is built upon the wealth of Java APIs, ditto for IronPython.