The QCon conference took place at San Francisco, and it looks like it was an extremely interesting conferences, with speakers from Spring, eBay, Linked-In, Sun, Oracle, Yahoo, Google and Gigaspaces.
Nati Shalom’s has written a wonderful summary of lessons learned at the QCon, with good hints about building highly scalable architectures.
Slides from the QCon are available as well.
Especially check out the Linkedin architecture.