Yatlas provides a minimap-based map of the world (reasonably high detail).
There are two different modes:
This view is somewhat similar to Atlas, and to move around right or left click and drag on the map itself. You can choose which map (currently only Kalimdor and the Eastern Kingdoms) at the top. Also, using the scroll mouse button changes the zoom.
To the right, the data tab contains points of interest and the options tab controls the visibility/position of the minimap button.
This view is somewhat similar to the world map, and non-transparently covers the entire screen. For the most part it is similar to the normal view, such as movement being controlled by dragging the screen around and scroll mouse button changing the zoom.
NOTE: CTMapMod, Gatherer and MapNotes support is currently broken.