There are a lot of project management tools that are pretty much glorified web boards, and they're pretty popular. Basecamp for one, PBWiki for another.
There are benefits to having a shared archive of communication, and the good systems allow for all sorts of stuff like bug tracking and file repositories. I know I use them all the time, and am glad to have them.
Obviously if it's a one-time message you should keep it as simple as possible. Straw men are fun, but even yours isn't actually all that different from my day to day work, except we don't do it retarded.