The new kids' movie "Rio" hitched its tie-in wagon to Angry Birds, with great success. The lesser-known
"Hop" went the Doodle Jump route, and the results are no less entertaining. Tilt your iDevice to control E.B. (the Easter Bunny's son) as he hops ever higher, gathering power-ups and, of course, Easter eggs. It's relentlessly fun, just like the original on which it's based. (Free)