First of all - congratulation with nice program. Keep up a good work.
And a suggestion: it would be awesome to get task manager embedded into on of the rings - with two mouse clicks you can switch between your programs without need to go to the edge of the screen (and with all those big modern monitors it's not convenient to read the bottom line of icons too).
Also it would be nice to have ability to show circle dock with combination of mouse key. Lets say like "right click + middle click" - this way middle click will be left to such functions as open link in the new window/tab in moder browsers.