First of all, I find SliderDock really great and fun! Flipping from wheel to wheel. And then watching the wheel turn as you choose what you want to open.
— I would like it more obvious what wheel I am on. If each wheel could be given a name or a lable or a color or a picture (perhaps in the middle of the wheel) this would make it easier for me to identify which wheel I am on or which wheel the desired program is in.