Hey someone figured out another good use for twitter. This is essentially the same thing my library is doing with twitter. Sending out notices for events, sales, new information to the public. Whenever a new book is released, twitter knows about it. Amazon and organizations like Woot are doing the same thing, releasing information and sales through twitter. This is about marketing people!
Take a look at this:
This is a great example of how instant communication tools like Twitter are being used for commercial means. Basically the Amazon and Woot deals are feeds of offers, pushed out via Twitter. These kind of feeds could also be received in your RSS Reader, or email.
The next step for Amazon and Woot is to allow personalized Twitter feeds - e.g. you could sign up to an Amazon Twitter feed of just music deals (if music is what you want to buy). This would equate the "followers" of Amazon's Twitter feed to leads for the company - very fine grained ones, because Amazon knows what their "followers" want, based on which e-commerce deals they sign up for via Twitter.
The next phase for Amazon is EXACTLY what I am trying to do with twitter. Establish customized feeds so that specific patrons can sign up for their particular interests. Parents can sign up for new kids books, kids events, and other information. There is so much more that can be done with this. Very cool stuff.