Question: I know a fair amount about the current javascript engines. What techniques have arisen in the intervening time? Please provide links to freely available information.

edit:

To clarify, I'm looking for new techniques that are being implemented or have recently been thought up for improving javascript execution speed.

Answer: 
Javascript virtual machines in the future will have a method JIT and a tracing JIT like firefox 4 and JägerMonkey/TraceMonkey.
They [use the GPU](http://blogs.nvidia.com/ntersect/2010/09/next-killer-app-for-gpus-internet-explorer-9-beta-launch.html).