You can view revised Article 9, along with the Official Comments, at http://www.law.cornell.edu/topics/secured_transactions.html.
You can find some additional information on PMSIs, and other aspects of secured transactions, at http://www.wsba.org/media/publications/barnews/default.htm.
You can find information on secured transactions at http://www.law.cornell.edu/topics/secured_transactions.html. You may also want to visit http://www.law.georgetown.edu/olin/papers/wallac1a.html for an interesting paper on international initiatives in this area.