Ok, here are some rumors.
Some private detectives from RPGDot.com have searched deep in Interplay forums and have found this theme
http://forums.interplay.com/viewtop...0&postorder=asc&start=15 , dated June 17, 2003.
In this post, some J.E. Sawyer shares his thoughts on some project named
Van Buren, making so many connections to Fallout series, that mr. detective from RPGdot made his final verdict: Van Buren - is a secret name of Fallout 3 himself, the great and the mighty!
Will wait for further details of this investigation.
(I have found this information from russian web site
http://www.xaos.ru/news.php?news=9791) And even more info on Van Buren at No Mutants Allowed from August 01, 2003:
http://www.nma-fallout.com/