In entry #3, again, I like the incorporation of a handwritten font and the sticky note imagery. I like that the design is roughly square (about as high as it is wide), although that's not necessarily a strong requirement if the concepts come across more strongly with another rough shape. Is there a way to incorporate a notion of the left-to-right dynamic motion of the sticky notes being "pulled" across the board?
Also, on #3, can we try slightly darker colors or shades of the ones you have? I'm worried that the pink (especially) and yellow (to a lesser extent) sticky notes' borders will "wash out" against a white background.