I don't think that Amazon is OK with hacking the Kindle - here is a quote from their Terms, warranties and Notices page:
Quote:
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No Reverse Engineering, Decompilation, Disassembly, or Circumvention. You may not modify, reverse engineer, decompile, or disassemble the Kindle or the Software, whether in whole or in part, create any derivative works from or of the Software, or bypass, modify, defeat, or tamper with or circumvent any of the functions or protections of the Kindle or Software or any mechanisms operatively linked to the Software, for example, by augmenting or substituting any digital rights management functionality of the Kindle or Software.
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To me that says they certainly don't want anyone modifying the software to allow the screensaver or font hacks.
None the less, I, and many others, have applied the jailbreak and at least one of the hacks, and the Amazon "powers that be" would have to be totally blind as well as stupid to not be aware of the various hacks available for the Kindle. As daffy4you stated, they haven't made an issue of this nor has anyone been arrested for using or programming the hacks, at least not that I am aware of.
Their newest firmware for the Kindle 3, 3.0.3, has prevented the ability to apply the "old" jailbreak and hacks, but does nothing if the jailbreak and hacks were already installed, and I bet our jailbreak gurus have already figured out how to circumvent Amazon's latest attempt to secure their software and keep it "unhackable."
Of course, adding your own screensavers or choosing a preferred font isn't the same as "stealing" and modifying the entire Kindle OS for use with another device, for example, so I don't see why Amazon would feel bound to prosecute someone for it, or decide not to give warranty service. Even Microsoft and Apple allow their end-users to personalize their computers! At some point I should think that Amazon will change their OS so that users can add screensavers and fonts without having to use a jailbreak.
Holly