I just published an analysis on "Secure Boot": https://fsfe.org/campaigns/generalpurposecomputing/secure-boot-analysis.en.h...
FSFE's goal is to ensure that the owners of IT devices are always in full and sole control of them. This fundamental principle is recently being challenged.
With a function called "Secure Boot", which will be deployed in computers starting 2012, manufacturers of IT hardware and software components are striving to get into a position where they permanently control the IT devices they produce. Hence such devices will be "secure" from the manufacturer's perspective, but not necessarily from the owner's point of view: The owner can be treated as an adversary. By preventing uses of the device which the manufacturer does not intend, they can control and limit what a general purpose IT machine (e.g. a PC, laptop, netbook) may be used for. In case of IT devices with internet access, they can alter these usage restrictions at any time without even informing the device owner. As a result, IT manufacturers at their will can take away common rights owners of products usually receive.
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Best Regards, Matthias