Although I don't have an iPhone, I won't keep that from me recommending some cheap and fun apps. If you have an iPhone, consider getting Must. Eat. Birds. It's a funny, random game with good appeal during those odd in-between times when you have nothing to do, but you don't have enough time to devote to something serious. In other words, it's a great combat for boredom. You can try it online for free at their site before deciding to buy.