I can't see that this has been mentioned here, before Easter, Sky should have completed opening the Anyime+ service beyond their own IP address ranges.
Details here:
http://www.dailymail.co.uk/sciencetech/article-2093866/BBC-iPlayer-arrive-Sky-boxes-free-later-year.html
It seems you have to register your interest via the Sky website and they'll mail when you're active.
http://www.idnetters.co.uk/forums/index.php/topic,28298.0.html ;)