Jim has been posting some interesting and pertinent articles, and some have asked for links to more info. While I don't know where Jim is getting his excellent open-source intel, here are links to some related sites I read regularly.
I read this today, another synopsis of Chinese submarine growth:
http://www.informationdissemination.net/2012/02/plan-conventional-submarine-fleet.html#disqus_thread
That site (http://www.informationdissemination.net) is a wealth of information on Navy matters.
Also,
http://www.wired.com/dangerroom/
For military matters in general
http://nosint.blogspot.com/
More Navy-specific news
http://thesubreport.blogspot.com/
Submarine specific news
Just thought I'd add that to this thread for any who may not know about those sites and find them entertaining, as I do!