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As you can see, there seems to be some problem with the capital letter 'S' on Chrome 10.0.648.82 beta. (It seems to have a problem with the number '0' as well.)
Edit: I'm using Ubuntu 10.10 64-bit.
I can't reproduce this in Chrome / Windows 7. As Gilles noted, this is probably an OS or browser specific problem of some kind with fonts.