Just yesterday I commented on a post at Tim Brannon's The Other Side Blog that it would be nice if Wizards of the Coast would come out with a nice boxed reprint of the Moldvay Basic D&D. Well, WotC hasn't done that yet but they DID re-release the Moldvay Basic and a whole bunch of other stuff in PDF. It looks like they have stuff through 3.5 and a few 4e items. How cool is that!?! I don't see the Expert set yet but what is there is a start. Oh, they have B1 "In Search of the Unknown" free for awhile. You can find the stuff over at DTRPG.