I found this quote in some post comment while browsing some open-source / multitouch related sites/blogs:

Humans have been using multiple fingers to do things for quite a long time. If Apple does indeed hold patents on such basic concepts as multi-finger interaction, then I count myself lucky that the ...

The new version of MyPaint just came out. It is the first official version since I became involved in the development (not much of my work was merged to this version, but I expect that this will change till the next release). Original announcement can be found here.