I have been learning about iPhone development over the past few months, and enjoying it very much. The culmination of my learning so far is an app called Two Letters which is now available in the App Store. It’s a game that helps you learn and memorize the two-letter words used in Scrabble and crossword puzzles.
Two Letters can be found here: http://itunes.apple.com/app/two-letters/id404274803
Have a great day!