cross browser - @font-face and letter-spacing in webkit

Question

I just discovered that letter-spacing doesn't always work in webkit (and perhaps other browsers?) when embedding fonts. I've tried it on two different fonts and received different results.

"League Gothic Regular" will work

http://www.theleagueofmoveabletype.com/fonts/7-league-gothic

"Quicksand Light" will not

http://www.fontsquirrel.com/fonts/Quicksand

What's the skinny? Is there a way to force the hand of non-compliant fonts?

Quick note: Firefox does seem to apply to both fonts.

Answer 1

I'm not sure I have the answer but I was having a word-spacing problem with League Gothic from Font Squirrel, I couldn't figure it out until I re-generated the font-face stuff on the site using different settings. I use the Paul Irish's Bulletproof method...

Font Squirrel settings http://img59.imageshack.us/img59/8784/screenshot20100428at132.png