What version of Google Earth supports tilt and 3d rotation?

All versions of Google Earth (v4 through v6 including free and Pro versions) support 3-D tilt and rotation, which can be controlled via the mouse or keyboard in addition to 3rd party input devices such as 3Dconnexion's Space Navigator 3D mouse.

For 3-D view to be enabled make sure 'Show terrain' is checked in the Tools/Options/3D View panel. Also the 3-D Buildings layer should also selected to get the full 3-D effect.