If you don’t already know it, the Groovy language, currently still in its infancy and developed by James Strachan, is definitely worth a look. I linked to it before, but after having built and played with the version from CVS, I’m absolutely hooked.
This is a single archived entry from Stefan Tilkov’s blog. For more up-to-date content, check out my author page at INNOQ, which has more information about me and also contains a list of published talks, podcasts, and articles. Or you can check out the full archive.