Wow, Chrome realy improved its javascript performance with a new version of their javascript engine v8 that now supports faster string processing. The results speak for it self. The Chromium builds are a bit buggy, but are damn fast if you are willing to give it a try.
Also, Windows 7 x64 works without the --in-process-plugins tweak with the later builds.
RESULTS (means and 95% confidence intervals)
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Total: 671.2ms +/- 10.3%
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3d: 87.2ms +/- 17.4%
cube: 23.6ms +/- 20.6%
morph: 37.0ms +/- 21.6%
raytrace: 26.6ms +/- 28.5%
access: 54.8ms +/- 18.2%
binary-trees: 3.8ms +/- 27.4%
fannkuch: 17.6ms +/- 25.3%
nbody: 21.6ms +/- 34.2%
nsieve: 11.8ms +/- 13.7%
bitops: 42.2ms +/- 23.2%
3bit-bits-in-byte: 3.2ms +/- 32.5%
bits-in-byte: 6.8ms +/- 20.0%
bitwise-and: 12.0ms +/- 19.4%
nsieve-bits: 20.2ms +/- 31.8%
controlflow: 2.6ms +/- 26.2%
recursive: 2.6ms +/- 26.2%
crypto: 36.4ms +/- 12.5%
aes: 12.2ms +/- 13.3%
md5: 13.2ms +/- 16.8%
sha1: 11.0ms +/- 13.8%
date: 97.4ms +/- 7.9%
format-tofte: 48.8ms +/- 10.7%
format-xparb: 48.6ms +/- 15.1%
math: 79.6ms +/- 18.2%
cordic: 41.8ms +/- 18.5%
partial-sums: 28.2ms +/- 21.2%
spectral-norm: 9.6ms +/- 19.6%
regexp: 15.6ms +/- 15.5%
dna: 15.6ms +/- 15.5%
string: 255.4ms +/- 12.9%
base64: 39.0ms +/- 20.9%
fasta: 29.8ms +/- 16.5%
tagcloud: 50.4ms +/- 16.3%
unpack-code: 88.0ms +/- 16.6%
validate-input: 48.2ms +/- 20.9%
Click Here for the SunSpider results page.