Business standard mileage rate for 2009 decreases; other rates also decrease:   
IRS has announced that the optional mileage allowance for owned or leased autos (including vans, pickups or panel trucks) is 55¢ per mile for business travel after 2008. That’s 3.5¢ down from the 58.5¢ allowance for business mileage in the last six months of 2008. Further, the rate for using a car to get medical care or in connection with a move that qualifies for the moving expense deduction is 24¢ per mile, down 3¢ from the 27¢ per mile allowance for the last half of 2008. Rev Proc 2008-72, 2008-50 IRB , IR 2008-131