What browser are you using? I'm on Safari 4 and the page looked like this http://i31.tinypic.com/mvmgx0.png until the font was downloaded (took almost 10 seconds on my slow connection).
Edit: I tried it with Firefox and it does indeed use the default font until the new one is downloaded. The transition is not nice but better than nothing.
Edit: I tried it with Firefox and it does indeed use the default font until the new one is downloaded. The transition is not nice but better than nothing.