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Is there a better document that explains how the GC works in the latest Java 6 releases (particularly Hotspot)?

I'm doing some GC tuning these days - and there seems to be a lot of false/stale information out there. Something this readable, but accurate, would be helpful.

http://www.oracle.com/technetwork/java/javase/gc-tuning-6-14... is the canonical source.

G1 isn't necessarily the right solution for everyone. In my measurements I found it to be more unpredictable than concurrent mark&sweep. I'm still waiting for it to be improved.

Did you have concurrent collections turned on? It almost always reduces overall throughput of the collector. However in many workloads I expect the G1 to be superior to the current throughput collector....

Could you point out what is incorrect? I'm happy to fix it if you can point out the errors and the source of your information.

G1 will be great, at least in theory, but it's not production ready. Many of our readers need to tune their GC in WebSphere/WebLogic Environments in production environments, they can't use G1 yet.