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There is a legitimate question here: what kinds of activities have the potential to damage fastboot capability? You might call it the "superbrick". My impression is superbricking is really quite difficult: you'd have to have some kind of runaway process overwriting the mmc flash chip (could that happen by writing to the normal file system, eg with a dd?). If TCCPhreak knows what happened with their Kindle, that would be interesting to know.
But of the dozens of people who've reported their bricking problems on this forum, all but a handful of them have been able to use the fastboot method combined with a clean disk image (or some even easier method), to get it back, and it is now a relatively straightforward, well documented procedure. The only thing that's risk free is to not jailbreak your Kindle (since even if it breaks on its own you can send it back) or use any other mods, but I think the risk of playing around with scripts at the moment is remarkably low. Just make a backup of all the partitions before you start.
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