I am a run of the mill enterprise sysadmin. The largest cluster I've ever built was 128 node oracle grid and I've never had to solve a scaling problem more difficult then "add more ram."<p>I've always been interested in larger systems and with the success and volume of web apps there are more and more 1000 plus server deployments out there. I want to start applying for these types of jobs and was wondering:<p>What books, blogs, forums, groups, whatever can I read or join to start coming up to speed on how the top tier web app infrastructures are built, maintained and scaled?<p>thanks.