Galactica offers an interactive experience that will fascinate and mesmerize you, and at $0.99 is well worth the money. Who’d have thought dragging your finger on a screen could be so relaxing?

Instaviz is a graph visualization app. It is based on the open source software Graphviz, which is available for the Mac, Windows, and Linux. With Instaviz you can easily draw shapes such as circles, ovals, squares, and triangles, label each, and then connect them to one another. You can then export these to a number of different services, including MobileMe.