Between Jan. 1, 2008, and March 31, 2009, all U.S. households will be eligible to request up to two coupons, worth $40 each, to be used toward the purchase of up to two, digital-to-analog converters.
The National Telecommunications and Information Administration (NTIA) has responsibility for administering the coupon program. (Please note that these coupons will expire 90 days after mailing).
You can apply at the Converter Coupon Application.
Now keep in mind that because they say all household are eligible this does not mean you will be if you subscribe to a pay for channel service.