Peak Systems has Diptic (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly 99-cents) for a limited time.

Diptic helps you easily combine multiple photos and apply artistic effects to create exceptional photo collages that can be shared with friends and family via email, Facebook, Twitter, Flickr, Tumblr or Posterous. With 14 filters, rounded borders and 52 customizable layouts, there are unlimited options to create unique images!