It has been noted on DF several times recently that the "Older Edition Downloads" page on wizards.com has disappeared. (This the page that a list of free pdfs, e.g. the Orange B3, L2, I10 ...). Apparently the pdfs are still hosted on wizards.com but the main page has disappeared.

http://www.dragonsfoot.org/forums/viewt ... 11&t=44847

http://www.dragonsfoot.org/forums/viewt ... 11&t=44373

Lippy on DF noted that the Acaeum links in the Library section are stilling working:
http://www.acaeum.com/library/library.html

The Acaeum doesn't have links to everything that was available. This blog has compiled a list of links to wizards.com that still work:
http://poleandrope.blogspot.com/2010/07 ... purge.html