If you're in charge of marketing at your stud/stable (or related company) then you could do a lot worse than read the PDF article titled Marketing Wisdom for 2005 that appears on the MarketingSherpa website. It includes advice from all number of professionals on email marketing, search marketing, site design & conversion tactics, advertising (online and off), direct (postal) mail, general marketing advice, B-to-B marketing, PR & blogging, growing & managing clients ... and so on. It's brilliant.