I was recently asked about the security of vPro and Intel Active Management Technology, therefore I started to pull together all the resources I leverage when discussing this topic and help to alleviate concerns of the Information Security folks in the IT shops. here are those links and if you find additional ones that help please add on to the blog.
Hardening Measures Built into Intel® Active Management Technology
http://softwarecommunity.intel.com/articles/eng/3703.htm
AMT System Defense Usecases
http://communities.intel.com/docs/DOC-1278
Intel® Active Management Technology Protect Use Cases
http://softwarecommunity.intel.com/articles/eng/1031.htm
Intel® Active Management Technology Use Case #7: Hardware-Based Isolation and Recovery (Protect)
http://softwarecommunity.intel.com/articles/eng/1179.htm
If any questions on security of vPro please let me know.