hyle

I built (in less than a couple of hours) a proof of concept prototype that generates LESS files

http://zena.appspot.com/orso

obviously there is a huge amount of room for improvement.

Talking about books I would recommend Introduction to Functional Programming 1st edition (Prentice Hall 1988 -- the second, paradoxically, is "spoiled" by Haskell), by Bird and Wadler.