I've posted a review of the Peavey AmpKit LiNK on GeekDad.
Peavey has arrived a little late to the iPhone practice amp market, but they have come up a very strong entry. AmpKit is an iOS application, compatible with the iPhone, iPad, and iPod Touch. The AmpKit Link is sold separately and is an adapter that allows you to connect your guitar and headphones up to your iOS device. Their marketing department hooked me up with a free AmpKit Link and download code and I’m very glad that they did.