Comparing IE10 to Chrome 10 isn't exactly apples to apples. Chrome 11 or 12 should be compared to IE10 since those are the development versions.
That is true - comparing an unreleased IE to a released Chrome isn't fair.
However, the released Chrome was much slower than all other released browsers - Firefox, Safari, Opera, even IE9. Chrome usually does well on benchmarks, so it is interesting to see it doing so poorly on real-world code.
It's updated so frequently I'm not sure there's a better way to get a specific build.
There's also an AppleScript to download the latest 'stable' continuous build of Chromium (full disclosure: I wrote/modified parts of it) here: https://gist.github.com/370298