An interesting article here from Ramon Barquin on communicating the KM message. His central message is not only that you need a simple, understandable message, but that you also need constant repetition. Here's a sample.
A memo from the CEO isn’t enough to build support for business intelligence,
knowledge management, or recycling in the lunchroom. Constant repetition from a variety of sources, both spontaneous and carefully strategized – meetings, memos, word of mouth – is the only way to do it, and this brings us to the Rule of 151.
Scientific? Maybe not, but the Rule of 151 goes something like this. The first 50 times you talk about the business advantages of (KM), nobody seems to hear you. The second 50 times you explain it, they don’t understand. And the third 50 times, they just don’t believe it.
Persist beyond this point, however, and you see progress. Colleagues, peers and bosses hear what you’re saying. They understand it, and more importantly, they repeat it. Fueled by word-of-mouth, even the most offbeat notions can evolve into conventional wisdom. Marketers call it branding, politicians call it campaigning, cynics call it brainwashing. Call it whatever you like: repetition works.
And a really useful summary paragraph at the end
Shortly after Michael McCurry, Clinton administration press secretary, left the White House, a writer for the Harvard Business Review asked what McCurry says when people ask him how to become better communicators. “Know what you’re trying to say and say it precisely and simply,” McCurry answered. “And be committed to telling the story over and over again. You have to persevere.”