I'm learning Lisp with a friend and "blogging" it as he and I go. So far, nothing much. Just getting into the first few chapters. I'll probably throw some more languages in there as I go.
My boss gave a short, high-bandwidth talk on Scala today. Bad ass little language. I may get to start using it at work.
In the "always hire good people" department, I was extremely pleased that all of my coworkers are very well versed in languages and computer sciencey stuff. At my last job, people knew how to write good software. I have no idea if the new guys heavy-weight application developers, but that's not what this job is about. It was very nice to have every one immediately understand tuples and higher level language concepts, mainly so they can teach me. I took this job because it takes me into a new area I haven't had before; namely a more rigorous and scientific look at software as she is run.
Most of the jobs I've had are application jobs, which are fun. But they're not always challenging in the "learning more new stuff" way. So far, this job is.