It's been a long time coming, but London's free Tube Wi-Fi network has finally gone live today in two stations, with four more to follow by the end of this week. Travellers at King's Cross St. Pancras and Warren Street will now be able to browse the web from the stations' platforms. To access the service, Transport for London (TfL) says you simply need to connect to the network and register your email address.

The two launch stations will be joined tomorrow by Oxford Circus and Green Park, with Victoria and Euston set to go live on Saturday. These stations are all on the Victoria line, which has apparently been picked to launch the network. TfL plans to install wireless networks at 80 Tube stations by the end of July, expanding to 120 by the year's end. The free Wi-Fi is provided by Virgin Media and is being launched in preparation for the 2012 Summer Olympics, which kick off on July 27th.