I am just starting using Darktable 1.4 under Mac OS X 1.4. Before I was using Raw Therapee. What I liked about Raw Therapee are the profiles it ships with, especially as the RAWs that come out of my EOS 20D look very desaturated and boring as they come out of the camera, and the Raw Therapee "Default" profile instantly gives the pictures some punch. It was a good starting point and saves a lot of work. Good profiles are also Punchy and Pop4 BW.
Is there anything similar for Darktable?
Sometimes I like to fiddle on pictures for hours, but sometimes I just what to apply a precanned profile and be done!