"Learn to say 'I don't know.' If used when appropriate, it will be often."

Appropriately, About.com is running a toplist of Rummy quotes. There are some real gems in there, too:

"I don't know what the facts are but somebody's certainly going to sit down with him and find out what he knows that they may not know, and make sure he knows what they know that he may not know."

"I'm not into this detail stuff. I'm more concepty."

"Needless to say, the President is correct. Whatever it was he said."

"Death has a tendency to encourage a depressing view of war."

Oh, just go read them all.