I've never been a huge fan of L.Ron Hubbard's Writers of the Future, but it's been going for 25 years now, and a celebratory book has been announced. This press release includes a photo of Bradbury with A.E. van Vogt and Jack Williamson at the original launch back in 1985:

http://www.prweb.com/releases/.../04/prweb3878814.htm