Over on RPGNow Mongoose has released several Classic Moorcock products including 1e Stormbringer and 4e Elric! in PDF. You can check it out here.
While I never used Stormbringer myself I always enjoyed reading the books. Like other Chaosium RPGs of the time it is based on Basic Roleplaying. Also from what I heard let's hope they release the Corum supplement as supposedly it makes for a kick ass general Swords & Sorcery RPG once stripped off it's setting specific elements.