Media:
BBC News
Bloomberg
CNN
Le Monde
PR Week
Reuters
The Daily Telegraph
The Economist
The Financial Times
The Frankfurter Allgemeine Zeitung
Finanz Nachrichten
The Guardian
The International Herald Tribune
The süddeutsche Zeitung
The Times
The Wall Street Journal

Corporate Communications:
Chartered Institute of Public Relations
International Association of Business Communicators
Melcrum
V-One Design Solutions Ltd

Business Organisations:
Business Link UK
Confederation of British Industry
Institute of Directors
UK Department for Business Innovation and Skills

Reference sites for business writers and editors:
Online dictionary
E-Editor
Encyclopaedia Britannica
Plain English Campaign
Quotations
Reference
Thesaurus
Translation

Other useful reference sites:
Currency converter
Market intelligence
UK Government
UK National Audit Office
UK Office of National Statistics
World Factbook