Circle Dock and Service Profiles were both mentioned recently up on ghacks.net
Circle Dock was another contribution to the Donation Coder Programming Challenge. It was an entry by Eric Wong who contributed not only this but another software program to the Challenge. Circle Dock is a program launcher, but not your usual stationary one. It is activated with a shortcut, the default one is CTRL Windows, and appears always with the mouse as its center.
Windows XP does not offer a way to quickly switch between different service profiles. The only way would be to enable or disable all services manually which would be quite a lot of work. Service Profiles was an entry to the Donation Coder programming competition and it rightfully got a price there.