This blog has had a useful link to the online Guardian Style Guide for sometime. I've just noticed that The Guardian has now followed the Financial Times and The Economist in turning it into a book. Before the advent of the internet my FT style guide was always on my desk as a handy reference when writing news releases or articles. Today I'm not so sure of the benefit of a book. I do all my writing at the computer so it's just as easy to look it up on the internet, without cluttering my desk.
I'm always amazed at how many PR companies/people fail to use style guides. They write news releases to please the client or boss rather than using a journalistic style. My pet irritation is excessive use of capital letters in job titles etc.