The MIT Lightweight Languages Workshop
fxn points to this "article from Dr. Dobbs's Jounal on the recent Lightweight Languages Workshop, held at MIT's AI Lab." This is a nice followup to Simon Cozen's report on the conference, posted here in November.
Honestly, I think Perl is the ultimate light weight language, as it is not (in my opinion) suited for anything but lightweight tasks. Use perl for the things that you used to do with sed, awk and bash, and perhaps a few things that you didn't bother doing with those tools because it is too messy.
:-)) to learn ruby. Its extremely expressive and very maintainable. Too bad it got so little attention at that conference.
Joking aside, I really recommend developers who care about efficiency (not runtime