With the whitetail season approaching, I was looking around for the latest and greatest calls when I happened upon Primos's hunting call application for the iPhone. This thing is great, it has many of the Primos calls for all types of game. The sounds are realistic and you can even interact with the calls. If you are a hunter and own an iPhone, you must have this application.

Primos Hunting Calls: Speak the Language
http://www.primos.com/iphone/