The arrival of the new Google Blog search throws up a myriad of wonders.
Here's trust versus authority (on Google) from SEO Moves:
Trust means that a site overall is trusted. This will be one of the larger sites, with very high traffic, lots of content, one of the heavy players. This is a site Google trusts as a well established legitimate, respected sites. Amazon. Government sites. Wikipedia. Plenty of reasons to trust them, very few not to trust them. In my mind, I picture doing my own research on any particular topic, what sites do I trust? Trusted sites do rank higher even when less relevant. Trusted sites pass a lot of juice, a link from a trusted site is gold.
An authority would be a page or site that is an authority on a specific topic. This site may not be trusted, but this particular page, section, or site, becomes an authority on a topic. This is gauged by incoming links on the topic; the more links a site has on that topic/keyword, the more of an authority it is on that topic.
And...Trust and newspapers from "That's the Press Baby":
The problem with journalism's stock in trade, semi-omniscent objectivity, is that almost no one views the world with semi-omniscent objectivity. To see the world and see it whole, as a London Times editor once said of his calling (doing so before the Internet and thus having a not easily findable quote), is just not what the typical reader does, for the obvious reason that the typical reader is self-interested.