I know of a couple..
The grove, Huddersfield - http://www.groveinn.co.uk/now.htm
Wellington, Birmingham - http://www.thewellingtonrealale.co.uk/beerboard.php
A great idea from pubs IMO but not widespread enough. Even Norwich's Fat Cat seems to have let its website lapse in this regard.
I have often wondered, if you are searching for a particular beer on a certain day, if there is any way to find somewhere it is on tap? One of my most memorable pints was one of Badger's Golden Glory in Aberystwyth but I have never since found it on tap. The bottle is nothing like the fresh product.