As I mentioned in a previous thread, analog TV broadcast will cease in February 2009 (in the US). There are converter boxes available that will convert HDTV to the analog signal your old TV understands.
Converters run ~ $60 at bestbuy or circuit city. The federal government is providing coupons for $40 toward converter purchase.
The program is open now. You can apply
here.
There is also a very good FAQ there on what's happening and what to do.
You do
not need a converter if you have cable or a dish. Only those of us still getting their TV over-the-air need it.