Have you guys seen these tap handles?
http://www.micromatic.com/draft-keg-beer/tap-handles-pid-C100-4.html
http://www.micromatic.com/draft-keg-beer/tap-handles-pid-C150-6.html
These look pretty slick. It would be a fairly simple way to label which beers you have on tap. They have templates available to make the labels that go inside the tap handle.
http://www.micromatic.com/draft-keg-beer/tap-handles-pid-C100-4.html
http://www.micromatic.com/draft-keg-beer/tap-handles-pid-C150-6.html
These look pretty slick. It would be a fairly simple way to label which beers you have on tap. They have templates available to make the labels that go inside the tap handle.