I have been using chrome.jit for a while with conkeror, which leans on the Javascript engine quite hard.  It makes it noticeably faster.  Not a little faster, but "holy shit, that was fast" faster.  Back when JIT was first shipped in a release build, I enabled it on my eeepc, but not my more-powerful 64-bit desktop (since there was no JIT for x86_64 at that time).  The interface was much faster on the eee than on my desktop.  (Pages loaded slower, of course, because Javascript was not the bottleneck.  But the UI was much faster.)<p>Anyway, this is great news.  Who ever thought back in 1995 that their glorified blink-tag-scripting-language would be compiled to native code? :)