These are tools that are specifically designed for MAC users. Please feel free to add to my list!
GarageBand is a software product produced for Mac OS as part of the iLife suite (usually included in your initial purchase). You can record audio, play virtual instruments, make music, and even take music lessons.
iPadio is a phone blogs, commenting, recording and updating the world, or simply letting your mates know what you’re doing. It is tied in with Facebook, blogs, and other social media.
iShowU is made for Mac users. It is a screen recorder with 1 click publishing. Minimal fee to purchase.
Storyrobe is an exciting new digital storytelling application for the iPhone and iPod Touch.