Interconnected

Some style guides online (comments, as usual, in the link tooltip):

• BBC Radio News A-Z style guide, and how to write for radio.
• Carnegie Mellon Writer's Style Guide.
• The Economist style guide.
• Guardian Style guide (introduction).
• provenance: unknown, web copy guide [thanks John Senki].
• The Times Style Guide.

Some style guides available as books:

• Strunk and White's The Elements of Style.
• Wired Style: Principles of English Usage in the Digital Age.
• A list of style books (Associated Press; New York Times; Washington Post; others) [thanks Matt Pfeffer].

I'm specifically trying to find newspaper style guides online, but not having much luck (non-UK English ones would be good).