I have become addicted to a program on the I-phone called flight control. Basically you have a little airport with a helipad and two runways and have to land all of the planes that appear safely. It gets very difficult the further you get and is great fun. A bargain too at 0.59. Website is http://www.firemint.com/flightcontrol/index.html for more info. Word of warning though. It is dangerously addictive!
Great game but with one big problem - you just can't put it down!
Cheers
Nibbs