Another blast from the ancient past, the Fallout wiki The Vault released the planned setting timeline of the original Fallout GURPS project (working title: Vault 13: A GURPS Post-Nuclear Adventure). It "is one of the oldest released Fallout design documents, written by Scott Campbell."
In other anniversary blast-from-the-past news, No Mutants Allowed dug up some of the original marketing flyers of Fallout 1.