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Years back, Jakob Nielson listed a "top 10 mistakes of web design":
3. Not Changing the Color of Visited Links
A good grasp of past navigation helps you understand your current location, since it's the culmination of your journey. Knowing your past and present locations in turn makes it easier to decide where to go next. Links are a key factor in this navigation process. Users can exclude links that proved fruitless in their earlier visits. Conversely, they might revisit links they found helpful in the past.
Most important, knowing which pages they've already visited frees users from unintentionally revisiting the same pages over and over again.
These benefits only accrue under one important assumption: that users can tell the difference between visited and unvisited links because the site shows them in different colors. When visited links don't change color, users exhibit more navigational disorientation in usability testing and unintentionally revisit the same pages repeatedly.
Usability implications of changing link colors
Guidelines for showing links
Steve Krug says the same in Don't Make Me Think!
You should be able to turn on visited link colors by adding to the end of http://www.kypros.org/LearnGreek/theme/standard/styles.php :
a.visited { color: rgb(85, 26, 139) !important; }
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