"The days when agencies could give away their big ideas for nothing are over," says WPP Group chief executive Martin Sorrell in a Financial Times column last week.

It's hard to disagree with that, or anything else Sorrell said in the Financial Times article, which also suggested it was time to break down barriers between marketing disciplines, and start offering a strategic, discipline-neutral approach to solving client problems. Sorrell's giant holding company is now parent company to Ogilvy & Mather, which a ...