We now have the Arcade up and running again.
I'll copy the link to a more prominent position soon. For now you can see it in the above smaller navigation bar. Or you can access it from this link: http://forzainterforums.com/arcade.php
Enjoy and let me know if you face any issues. I'll be adding more games if there's demand and people enjoy wasting time on there (as if you're not wasting enough time on the forums already )