I have used Jahshaka in the recent past, but I find that most of the compositing features don't work (only the RT effects do) and the program crashes each time you open a DV-AVI. Moreover, there's little or no documentation and the forums on the official site provide no help. Even registering is a hassle there! It's a welcome initiative, just like Blender, Inkscape and GIMP (all free utilities that can also run on Windows), but with no documentation, there is a problem.