Transfers of Starwood points to British Airways generate a 30% bonus from January 1 to March 31, 2008. The bonus applies both to the base points transferred and to the 5000 bonus points for each 20,000 transferred. So 40,000 Starwood points become 65,000 BA miles instead of the usual 50,000. (In order to maximize your bonuses, don’t transfer more than 60,000 Starwood points in a day.)
Through February 29, Diners Club transfers to British Airways come with a 50% bonus. I long for the days of the 100% Diners transfer bonuses to BA, but those are long gone. At least they’ve stabilized at 50% coming along regularly.