The other patent involves a method to store and transmit "annotations", including the exchange of information or money that could authorize an annotation. Don’t get too caught up here on "annotations" like you’d get on a term paper or from your boss – this could refer to newer versions of songs, books, movies, etc.
Obviously not all patents find their way into products, but once you get past all the techno-speak it seems like Amazon has two very related, and very relevant patents for their ecosystem – together these patents could let you order things for yourself with a stylus or other device, even on other people’s Kindle Tablets. It could also allow for strict revisions in a file, whether due to collaboration or for the sake of commercial opportunity.
In short, Amazon is inventing new ways to let you interact with and purchase stuff through their ecosystem. If the rumors are true that we could see larger Kindle Fire models later this year, we might expect them to come with a stylus that could actually be pretty important to their overall function.