Easy Business English – this site has a lesson set programme you can buy, but if you want free stuff, you can sign up for a set of emails on The Five Laws of Business English. We like this site because it backs up what we say about listening!
White Smoke – Firstly, this site offers a free e-book – ‘The Ultimate “How To” Guide To English Writing. They also have some tips, and products to download, but these are pricey. Their blog has some useful tips.
English Central – this is a link straight to their huge selection of business videos on a variety of different themes and functions. Watch and repeat.