What is Trusted Computing?

An interesting (if you like technical) article excerpted from Amit Singh’s book, “Mac OS X Internals”, discusses trusted computing on Mac OS X (tools included)… 
 http://www.osxbook.com/book/bonus/chapter10/tpm/ 
 Also, Wikipedia has an excellent article describing TC and its the pros and cons… 
 http://en.wikipedia.org/wiki/Trusted_computing