This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
They're kind of different things, too: tags are generally intended to encapsulate behavior, can do things to their bodies, etc. Includes are primarily focused on presentation only, don't "do" anything, and so on.