No; you do not have to get a new TV. Your old TV can still be used after the coming change to all-digital television broadcasts.
Some friends mentioned this week that they thought that they were going to have to get brand new TVs before next February. No. A new TV is not required.
Here's what's happening. On February 17, 2009, all full power television stations in the United States are required to stop broadcasting in the old style system called "analog" and continue broadcasting in digital only. This is known as the DTV transition.
The DTV transition is a good thing.
Yes; it is correct that analog TVs will not work directly with digital broadcasts, BUT you still don't have to buy a new TV. All you'll need is a converter box for your TV and those are going to be very cheap or even free.
Whew! Thanks and very good to know. This whole thing is so confusing to me.