I've been waiting for this for ages, wondering why it doesn't exist... and now it does! TV streamed down your phone line for those who don't have access to a TV or an external aerial. Better than I thought it would be as well, i.e. provided by channels individually on their websites.
Just go to www.freewiretv.com to register and download the necessary software, and it gives you all the terrestrial channels other than ITV, as well as E4, More4, Film4, BBC3 and BBC4, all in pretty good quality. Definitely better than the quality of stuff you get on alluc and the like.
Sorry if this is old news, but I think it's excitiiiiiiing.