Essentially the Patriot Act (fall 2001) overrode "the wall" -- although changing culture and individual/group behaviors in large bureaucracies is far more difficult than simply passing a law or announcing new policies.
See this link for a good discussion of how many informal barriers can also exist - it wasn't just one wall but many walls, and countless forms of discouragement to intel analysts who might have something useful to contribute:
http://www.freerepublic.com/focus/f-news/1467315/posts
I think the anonymous intel insider at this link gives one of the best explanations I've seen of how (1) it wasn't just one 'wall' but numerous walls and discouragements; (2) while the problems certainly pre-dated the Clintonlites, in the '90s the problems and barriers were made much worse; (3) various walls always exist inside and among intel agencies, both for security and to protect civil liberties; but (4) the Clintonlites raised the walls higher and appointed bureaucrats who were (generally) much more concerned with protecting the Clintons politically than with doing the best job on intel.
Thanks, Enchante.
You can tell I enjoyed that 4 or 5 year respite from the Clinton garbage. A lot of details had walked in front of me completely unnoticed or at least uncatalogued.
Man, I've been catching up this week? :-)
Pinz