Until 31 December 2010, Sky TV customers in the UK and ROI with the Sky Sports Pack can get Sky Mobile TV on iPhone or iPod Touch for free (usually £6/€7 a month for iPhone), and live channels online for free, (usually only available for free to Sky TV customers with the relevant Sky TV Pack and Sky Broadband Unlimited or Multiroom, otherwise £10 per month). Availability of live channels depends on your subscription; some programmes are unavailable to show online. After 31 December 2010 you will automatically be charged the standard price for Sky Mobile TV until you unsubscribe. One offer for Sky Mobile TV and Sky Player per household.
Have just signed up to this myself and its quality. Will be perfect for ryder cup.
Did it through iphone app, click sign up, then login to sky online account to activate.
NB you will be sent a reminder before you get charged so can then cancel if not wanting to keep.