What we're actually all doing at the moment is feverishly thumbing through our bookmarked PHBs and DMGs trying to find the order-of-primary-sources rules.
from the (then) current version of the PHB errata file on the WotC site, dated 02/17/2006:
Errata Rule: Primary Sources
When you find a disagreement between two D&D® rules sources, unless an official errata file says otherwise, the primary source is correct. One example of a primary/secondary source is text taking precedence over a table entry. An individual spell description takes precedence when the short description in the beginning of the spells chapter disagrees.
Another example of primary vs. secondary sources involves book and topic precedence. The Player's Handbook, for example, gives all the rules for playing the game, for playing PC races, and for using base class descriptions. If you find something on one of those topics from the DUNGEON MASTER's Guide or the Monster Manual that disagrees with the Player's Handbook, you should assume the Player's Handbook is the primary source. The DUNGEON MASTER's Guide is the primary source for topics such as magic item descriptions, special material construction rules, and so on. The Monster Manual is the primary source for monster descriptions, templates, and supernatural, extraordinary, and spell-like abilities. Note: The most recent updates are shaded like this.
Since the FAQ isn't the official Errata file --
it's a file, and it's official, and it's errata by the dictionary definition (but not Errata -- consider that spells that do extra damage to Cold creatures don't do anything extra to cold creatures; we're looking for the noun phrase "errata file", not just a file which contains what dictionary.com defines as errata), it's not anything that can trump the PHB.
Same thing applies to customer service replies, author interviews, and (perhaps) humorously, direct revelation from the deity of your choice.