denkspuren: Factor @ Heilbronn University - someone has used Factor as a programming language in university courses and seems quite impressed. I myself also like Factor - in a way, the Factor-IDE gives off that old Lisp machine vibe and the language is just nicely compact. However, I often notice that when I play around with it, I end up spending a lot of time finding the right abstractions - there are just mountains of included code and while the documentation is good, there's a bit of a lack of tutorials on how to use the code. Best practices and cookbooks would be in demand. Factor is still fun, though.