Here are two really good blog posts on what's coming for Mozilla's JavaScript engine:
JaegerMonkey – Fast JavaScript, Always! -- David Anderson gives a nice overview of how we currently work and what's coming up.
Starting JägerMonkey -- David Mandelin also offers up some good high level information in addition to going into some pretty specific details.
We're probably not far from a world where all of the browser vendors are sharing these performance techniques and when we get there, as I noted in an earlier post, I think we'll see this particular performance "war" wrapping up with everyone winning.
