You're probably thinking of the American digital TV transition, which most Americans are also confused about :p
Basically, as of Feb. 17, 2009, all analog over-the-air broadcasts will end in the US. This means that anyone in the US that uses an antenna to receive TV signals needs to make sure their TVs have digital tuners, or else they won't see anything. The majority of TVs sold in the last few years do have digital tuners, and older TVs can easily add a digital-to-analog converter box that just screws onto the antenna cable that goes into the back of your TV.
In Canada a similar thing will happen, but we don't have to worry about that until at least 2011 (or later - even that date may be pushed back still).
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