This Automata iPhone Dock by Murtaza Lakdawala is clever and useful, a combination rarely found in DIY projects. All you have to do is crank and the dock turns from vertical to horizontal.
Just like in cars, the next evolution is to eliminate the crank and have an automatic version. Preferably one that you can push down on once and it'll crank all the way, but that can also turn slowly when you hold it down, for a more dramatic rotation. [Freewebs]