Daily Kos explains the potential attacks on Saudi oil infrastructure.
Talking Points Memo claims only the foreign oil workers need to worry in Saudi Arabia, in that the infrastructure remains an asset to whichever side comes out on top.
The Rocky Mountain Institute's 2001 update to the 1982 Brittle Power book is available here
From Chris Bond, in the Kos comments referring to an Alaskan pipeline:
one drunk with a rifle shut down that same pipeline, and a sixth of U.S. oil production, for 60 hours
Which reinforces the MOBJ post on clogging the funnel