This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Like you, I remain interested in this too, but so far I haven't come across a page where all of them are listed in one place. So I follow High scalability portal, and dev talk presentations on Slideshare and InfoQ to get some hints. Use their search facilities to search for architecture presentations by their developers, and derive numbers from them. Some other useful resources below: