I've been using NGUI the past week for the first time and I'm running into a small problem. How do you move multiple sprites at once? If the centroid of the sprites is behind a sprite, the move tool is blocked by the sprite drag, which only affects a single sprite. Dragging the label on the individual position components seems to snap them all to the same value.
Btw, excellent tool so far! I'm really enjoying the workflow of putting these together, and the anchor system is very affective for justifying groups of elements.