iPhone App Logos: 10 of the Best and Worst

Designing an iPhone app logo poses a big marketing challenge. The logo must be creative enough to stand out from the crowd, yet clearly convey its function on the iPhone's diminutive screen. It also has to tie into a brand's Web site and other marketing collateral. All this in a thumbnail's worth of space. Here are some iPhone app logos that do the job well (and some that leave us wanting more than cute animals or screen clutter).