Joyce Hesselberth, a local designer/illustrator and the woman behind one of my favorite local blogs, kidbaltimore.com, has created an app for the iPad called PrestoBingo SHAPES. It's aimed at kids ages 2 to 6 and, from the demo, looks like something my boys would love. It also has the super cool, clean aesthetic of all of Hesselberth's work. There no iPhone version yet, but Joyce tells me she's working on ways to make it manageable on a smaller screen.
Check it out!