Amazon is adding video and audio capabilities to its apps for the iPhone, iPad and iPod Touch:

Amazon.com . . . today announced a new update to Kindle for iPad and Kindle for iPhone and iPod touch, which allows readers to enjoy the benefits of embedded video and audio clips in Kindle books. The first books to take advantage of this new technology, including Rick Steves' London by Rick Steves and Together We Cannot Fail by Terry Golway . . .

 Here are a few thoughts that immediately come to mind:

• This reflects that more eBooks will offer multi-media going forward. And audio/video will likely become one of the distinguishing features over time vs. traditional books
• Kindle is battling iBook (Apple's eBook store) with rich media and has taken the fight directly to Apple devices. It may have to do the same for Android tablets. Still there is no Kindle for Android
• This is an admission by Amazon that its own Kindle devices (at least those out today) are being eclipsed by the more full-function iPad 

I wouldn't be surprised if we saw an Android-based Kindle tablet at some point in the future. In fact I would bet on it.