Here's an interesting one. Amazon has just introduced audio and video to the Kindle e-reader for both the iPhone, iPod touch and the iPad. But Amazon has not done the same for its own Kindle device, according to TechRadar.Why would you want such a thing with your Kindle? Well, because Amazon offers a number of books for the Kindle in multimedia editions such as Rick Steves' travel guides (which talk 'readers' through the cities), Best of the Beatles For Acoustic Guitar, and Bird Songs: 250 North American Birds In Song. With that in mind, it makes sense to integrate into the app, especially when you're dealing with devices like the Apple ones. It also encourages others to do the same with a larger market out there.'We are excited to add this functionality to Kindle for iPad and Kindle for iPhone and iPod touch,' said Dorothy Nicholls, Director, Amazon Kindle.'Readers will already find some Kindle Editions with audio/video clips in the Kindle Store today--from Rose's Heavenly Cakes with video tips on preparing the perfect cake to Bird Songs with audio clips that relate the songs and calls to the birds' appearances. This is just the beginning--we look forward to seeing what authors and publishers create for Kindle customers using the new functionality of the Kindle apps.'Of course, at the expense of growing its own e-book market, Amazon might just have hammered another nail into the Kindle's coffin. We suspect the potential gains must outweigh the losses. Well, you'd think so, wouldn't you?