One of the reasons Colemak scores high with users and on Google is user friendly openness.  But when I began clicking on web pages in the Forums, I had to remember which ones I had visited.  Other websites mark visited pages, usually by turning them to red instead of blue.  Django, Turbogears, or Pylons might help in this regard.  I am sure there are many other tools that allow you to do it.  Perhaps there is a switch in the tool you are already using.