A couple of older articles and links were added to both older articles sections here and here:
A CBS interview with Allison Janney probably dated around summer 2003 discussing the movie "How To Deal"
Link to official UK "West Wing" site (not updated since Season 3), has older cast photos and some interviews with cast members from the beginning of that season. Direct links to those clips currently functioning (at this time the majority will not play):
Home Video of "West Wing" Shooting in California August 2005