Sky has a special free offer running for sky subscribers.
If you don't have multi-room or the max broadband service sky charge you a premium to watch live TV on your computer/xbox*.
From today (april 13th) until 14th june you can watch/use the skyplayer free of charge.
The channels you receive will be dependent on your current subscription with sky.
"Enjoy great live TV from Sky online with Sky Player - absolutely free!
Between 13th April and 14th June you can watch up to 30 live channels, depending on your Sky TV package, wherever you are in the UK and ROI.
Simply register for Sky Player today and start watching straight away."
*not tested on my xbox