Wheel by Webshocker. Animated 2d gifs and illustrations. Motion graphics
UI wheel and buttons properly termed constraint buttons. Wherever an intrinsic scale is present you can be sure constraint buttons are in the mix. Further more the circle or wheel design offers economy of design
Radialslider - Anton Kudin Had an idea of this bit of touchscreen UI. Could be a bit more useful than a knob.
Vestas Mobile CVI; the tangible side of wind | Designit
Skeuomorphism in User Interface Design, What is It? - Designmodo