Stranger things have happened with the harmony source: http://mrdoob.com/blog/post/696
As for the WACOM integration, the docs here seem reasonably explanatory: http://www.wacomeng.com/web/release_notes.htm - thanks for the offer however :)
Just had a play with Colorillo, looks great!
I also did pressure sensitive drawing for Colorillo: http://colorillo.com/blog/2010/07/pressure-sensitive-drawing...
What would you like to know about it?