Calvetica for iPhone

If you think the built-in Calendar app on your iPhone or iPod touch falls short, you might want to give this streamlined app a try. While Calvetica's alternative interface may be jarring at first, a lot of thought has been put into streamlining the process for entering calendar events.

Instagram for iPhone

Instagram's simple photo editing features and social networking capabilities make it a fun tool for iPhone-wielding photobugs.