Apparently http://www.dndclassics.com has been registered by One Bookshelf the owners of RGPNow and DriveThru RPGs. If you poke around google cache you get this link to a FAQ. I know today my RPGNow library reported that module B1, which I bought in 2009, was updated. Here is the post on the OD&D discussion forum where I first learned of it.
Curiouser and Curiouser
Dual-Weapon Attack and Rapid Strike
4 hours ago