Authoritative list of Bitcoin resources?
There are four really authoritative places for Bitcoin-related information that I can think of.


The Bitcoin.org homepage, which is managed by the core Bitcoin developers. All names listed on that site and references made can be considered authoritative.
BitcoinTalk.org, this was the homepage for the Bitcoin community from the start. Most of the first ideas were created here and still this is the best place to get information from other authoritative people strongly related to Bitcoin.
The Bitcoin Wiki, were you can find all technical specifications of the protocol as well as more basic information about how to buy, sell or use bitcoins. The wiki is maintained by the developers as well as insiders that helped shaping the protocol.
Bitcoin on GitHub, were development of the main client happens and all changes to the protocol are implemented for the first time. You can also find a link to this place on the Bitcoin homepage.