Its a great bit of work, the brush engine is simple to pick up too.
I really wish deviantART would fork the github repo, its not a drastic departure from the current source. i'd love to see how the WACOM integration works!
I wonder how many people have paid for the extras in the DA version.
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?
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!
In particular, the brushes behave differently. Note how in Harmony the currently-drawn line interacts with old lines, whereas in dA's one it only interacts with its own current segment.
Harmony is all about the procedural generation of images by interaction with previously drawn points. dA muro doesn't really permit that at all... which is a shame, as that's a technique with really interesting applications
edit: My mistake. It detects when you're using the eraser, but that's it.
edi2: Actually some of the brushes do seem to be pressure sensitive but it doesn't seem to work on all of the brushes it should.