iPhoneinCanada notes that, just days after its last developer seed, Apple has released Mac OS X 10.6.3 Build 10D552 to developers. Developer seeding of this third maintenance release for Snow Leopard began in early January.
Apple Seeds Mac OS X 10.6.3 Build 10D552 to Developers
Apple Seeds Mac OS X 10.6.3 Build 10D552 to Developers