This article points out that the most productive people are those who use intra-corporate email effectively. Yes, you may be communicating with people two cubes away, but it can be effective and efficient. I agree with this concept. I work in a world where email is the primary means of communication, followed by meetings, and then formal briefings. I prefer email, myself, but the actual reason my job exists is to make charts for formal briefings. Weird world it is. Because of this I save every email I get. Gigs and gigs of them, just in case I actually have to dig one up to prove someone made such decision on said day.
The article by Tim Harford for Wired is here.