_The Pauseless GC Algorithm_ [pdf]
Paper from USENIX VEE ’05, by Cliff Click, Gil Tene, and Michael Wolf of Azul Systems, describing some details of the Azul secret sauce (via b6n)
Everything I Ever Learned About JVM Performance Tuning @Twitter
presentation by Attila Szegedi of Twitter from last year. Some good tips here, well-presented