Scala and the Lift web applicaton framework
That said, Scala is a very nice language that has two non-language things going for it: very efficient runtime performance with OK memory use and that it runs on the JVM. Scala looks to be a good language for AI development and its interactive console adds some of the advantages of interactive bottom up development - a style I like to use when working in Lisp, Ruby, or Python.
Until this morning I have only read about the Scala Lift web framework, but after reading Vivek Pandey's blog about running Lift I gave it a try this morning. The maven setup and default web application construction was all very smooth, and the generated code was interesting to read. I also like the way Scala unit tests work and the debug modes supporting both an interactive Scala console and running with an embedded jetty web server. Everything works very well together and the entire system has a polished feel to it.