Even if you only watch an hour or two a month of television a month, if even that, we're still about a month away in the United States from there being no such thing as analogue television signals and everybody either having to have a converter box to enable an older television to show the digital channels, or you need a newer television with a digital tuner, or it's the cable and satellite options to look into, otherwise you're locked out of the half a dozen hours of good television that they show every month, if that.
I think that the UK doesn't have to mess with this until 2012, though. At least, that's what wikipedia said was one of the events for 2012 unless somebody here from the UK with better info needs to go and update that wikipedia page.
It's a hastle, I know, but every once in a while there's an important enough of a news story, or important weather updates, or the odd documentary that you'd be furious that the television wasn't working that one and only night. The plus side for us and for the television stations and networks is that the television stations or networks with the new digital requirement are able to have as many channels as they can keep up with the hastle of maintaining 24/7 programing for. It's the one piece of equipment (for clarity) that runs their one station that could allow them to have 50 or 100, or just a really good second or third channel. So, fifty million new channels are theoretically possible where they'll show absolutely nothing except for once or twice a month when absolutely all of the channels will totally tick you off by showing something good at the same time.