Found out Boxee is basic - no special ports...uses Firefox internally as it's engine so should work on any VPN connection with a US IP.
It does work, but for some reason Hulu does't think I'm in the US, NBC did...and other networks did also...but Hulu was able to determine I wasn't?
Actually I went back in to try again, and it worked the second time...and the third, but then on the 4th attempt, it said I was outside the US again? So the US streaming sounds like it's "dropping" the connection and reconnecting? Does that make sense?