The Senate extended the $8,000 tax credit program for first-time homebuyers to April 30 and added a $6,500 tax break for existing homeowners who want to move up to a new home. House should follow suit in a few days. An extension had been expected - the $8,000 tax credit has helped revive the housing market, especially at the lower end. The program had been set to expire at the end of the month. (LAT)