Navigating the UV/Image Editor

Navigation in the UV/Image Editor is pretty simple: MMB drag to pan, and use the scroll wheel or Ctrl + MMB drag to zoom in and out. A left click positions the 2D cursor. Apart from that, controls are exactly the same as in 3D View: right click to select, RMB drag to move, and G, R, and S to move, rotate, or scale the selections.

Also, there are certain features from other editors that will work in the UV/Image Editor as well, such as the Hide and Unhide feature (H and Alt + H) or switching between selection modes with Ctrl + Tab.