For folks into the details of java, there's an interesting blog entry called "Our Collectors" over at Jon Masamitsu's blog, who apparently is a Sun GC guru. It has a nice low-down over the different collectors - what they are, where they are used, and how they can be combined.
Also, this is a good place for some insight into the G1 GC - "Garbage First", a new algorithm that is going to be the default in Java 7.
Some interesting discussion ensues, where Tony Printezis, apparently another Sun insider, chips in with comments.
http://blogs.sun.com/jonthecollector/entry/our_collectors
Also, don't miss this good whitepaper, Memory Management in the Java HotSpot™ Virtual Machine (pdf, April 2006).
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