EFF: Trusted Computing: Promise and Risk
Long but worth reading.
We recognize that hardware enhancements might be one way to improve computer security. But treating computer owners as adversaries is not progress in computer security. The interoperability, competition, owner control, and similar problems inherent in the TCG and NCSCB approach are serious enough that we recommend against adoption of these trusted computing technologies until these problems have been addressed. Fortunately, we believe these problems are not insurmountable, and we look forward to working with the industry to resolve them.