I am typing this in the G5 build of 10.0.1pre, which has Ben's branch rework in it and Dave's square root (slightly modified). The G5 doesn't benefit from the square root, of course, and on SunSpider it only dropped a deceptive 100ms or so (from 1050ish to around 900 -- but this meets our target), but one test is, as usual, deceptive: Dromaeo rockets to a ridiculous 180+ runs/sec, and V8 is 45% faster.
I'm going to run 7450 and 7400 builds off today for conformance testing on the lab systems here at Floodgap Orbiting HQ. If they pass, then the last thing to do is switch the build snippets to run from the ESR and update the build documentation. If all goes well, you'll get to play with this new hotness this weekend or earlier. More strong work from our contributors!