Just to clarify, digital TV is not the same as high definition TV. A digtal TV transmission can be standard definition. The 2/2009 switchover is for over-the-air broadcast only. It doesn't apply to cable, although they will go all digital eventually (once doing so won't mean pulling the plug on a significant number of subscribers).
SD TV will still be with us for a long time - probably until the large majority of TVs are HD compatable.
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