I do not know if all of you are aware of its existence, so I decided to post it here just in case. To quote the editor: This online edition of The Times Style and Usage Guide (published January 2003) aims to provide a quick reference for readers to the everyday pitfalls of English grammar, spelling and names of people and organisations. It was designed originally as a guide for Times journalists, to help them through the most frequently recurring problems in writing with speed and accuracy for a daily newspaper. The guide is not designed to be an all-embracing thesaurus; some of the spellings are a matter of preference for The Times and the alternatives are not necessarily wrong. Besides the main alphabetical list of entries, there are seven additional specialist sections on the Armed Forces, the Arts, the Churches, the Courts, Politics, Sport and Titles; and the most recent entries appear in a What's New section. In the alphabetic sections, the very latest entries always appear in red.
