Metaweb is doing very interesting work in developing a “wikipedia for facts” at freebase.com. I’ve talked to some of the developers, and they seem like the real deal. I’d recommend taking a lot at these job postings, even though they are only secondarily (or thirdarily) Lisp job.
While we aren’t using Lisp at Metaweb, several of us have quite a bit of experience with the language. We are doing a significant amount of work in Python, which feels very Scheme-like to me in everything but syntax.
If any Lisp-ers are interested in working at Metaweb, feel free to send me email (no recruiters, please). My email address is my first name at metaweb.com