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What you are missing is a little part of computer technology called Push Updates and its turned on by default. What push updates does is it allows amazon to install things on your kindle with out you having to do anything and is typically used by amazon for two things: book and firmware updates. What has happened is amazon pushed an upgrade to your kindle without you having to do anything, when you first setup your kindle on their web site they take notice of the version of the firmware (the software that runs the kindle) that you have and if they ever come up with an upgrade for your model of kindle they do what is called a wake on LAN, turns the kindle on via remote, and they push the upgrade to you then do a sleep on LAN, turns the kindle off. Or if you are currently doing something on your kindle they can notice that and wait until your kindle is idle then do the upgrade.
Many other companies do push upgrades: Sun Java, Microsoft and Adobe to name a few. I am not sure if you can turn this off on a kindle but in the case of Microsoft Windows you can do that if you so desire, however this means that you need to get the updates manually.
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