Here's the kerning in Firefox on Linux (Stock Ubuntu Gutsy):

Notice how the A and V overlap? That's correct kerning.
Here's how it looks in Firefox on OSX Tiger:

Aside from the overly aggressive anti-aliasing, see how the kerning is incorrect between the A and V. It looks the same in Safari 3.
Here it is again in Firefox on Vista:

Same kerning error. Looks the same in IE7.
So Linux gets it right, OSX and Windows get it wrong. We've come quite far.