I have today got iplayer working here, but with caveats!
Incredibly slow buffering (as had to route it via a hidden proxy network back to the UK)

Took 4-5hrs of being a computer geek to get it to work, not recommended unless your a geek.. Hence the caveats. (tweaking settings, and editing hidden config files)

But that said, just watched something called "frontline iraq" on BBC Player.. Although the 28min proggie took near 2hrs to buffer.

Off to try the same methos on Channel 4 OD now..