Gamelion Studios has Doodle Fit (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly 99-cents) for a limited time.

The task in Doodle Fit is simple: fit the given sets of blocks into the given shapes. Drag the blocks into positions in search for the layout that covers the whole shape. A level is complete when all blocks have been used and there is no more space free in the shape.