If you are done with all the tower defense games available on the iPhone platform (which actually is impossible considering that there are just gazillions of them!) and looking forward to something of a similar gameplay and fun factor, iBomber should be your next buy.
Ok, to start with iBomber is not a flight sim - sure, it makes use of an aircraft and has some aircraft associated factors in the gameplay but that's about it. The game revolves around pounding the heck out of ground and sea targets of your enemies, dodging their anti-aircraft guns and just going crazy with world war II style bombs. The game provides a refreshing gameplay diversion for all iPhone gamers and really brings a great experience to the world of iPhone games. No wonder the game is also featured in the upcoming "Best iPhone apps for the discerning downloaders" from O'Reilly.