Michael Barker and Martin Thompson's talk at the last QCon on the LMAX Disruptor, and other nifty lock-free techniques and patterns. 'Martin Thompson and Michael Barker explain how Intel x86_64 processors and their memory model work, along with low-level techniques that help creating lock-free software.'

LMAX's "Disruptor" concurrent-server pattern, claiming to be a higher-throughput, lower-latency, and lock-free alternative to the SEDA pattern using a massive ring buffer. Good discussion here at SO. (via Filippo)