It's all based on the work done by members here.
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It’s [the Sony Reader] also comparatively easy to tweak and hack, thanks to the way it’s designed. The core operating system is MontaVista Linux, and though the speed of response of the e-ink screen and the lack of a full keyboard means that you can’t really use it as a general purpose computer, there is a fair bit that you can do with it.
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How to hack a Sony Reader (The Register)