For those about to grok... we salute you!
Ok ok. I know it's bit too geeky to blog about what others are blogging (as well as have this meta-discussion of the fact). But I really must point out some Grade A Alpha Geek investigation by Kohsuke (little wonder he is considered a "rock star programmer"). I mean, color me strange, but I actually do find details of low-level assembly code produced by JVM's JIT compiler fascinating. I hope that doesn't quite classify me an Asperger.
Anyway, it is darn cool what all optimizations are being made. It also confirms my suspicion: current JVMs are not your yester-years simple stack machines any more: they are not only more complicated than you think, they may well be more complicated and clever than you can imagine.