Hi! First off, great work so far on this project. Although I might be biased as a .hack fan, I'm sure that people outside the .hack community will find this a useful launcher. I'm glad that someone has finally taken an idea from the games and actually made something of it (considering so many previous Altimit OS imitation projects that have failed over the many years)!
So onto a usability function. I was experimenting with SliderDock before looking at the tutorial as that is how I usually learn how to work a program. Because of that, my icons were in disarray and not quite organized. I was able to move the icons around within the ring, but I realized I was unable to do so between rings. That would definitely save some time for those using the program.
On an aesthetic note, is there a way to perhaps adjust the tilt angle? Lets say I decide to switch to a different wallpaper that there are very few ways I could position SliderDock to work well with the wallpaper. Assuming I'm unwilling to settle for another wallpaper, I'd have to change the angle of SliderDock before it would fit properly.
I think there were also some "dots" to space things out between icons in the old Mine OS, but I can make do with making false icons and skipping them at the moment.