I have been browsing gamedev for a while and at first noticed that the color differences between a clicked link and a non-clicked link were rather similar. I attributed this to my poor eyesight (currently being corrected with -7.25 and -6.25 glasses) and figured I would eventually get used to the similarity. I have not been able to and I find it rather difficult.
Here is an image of how the site is rendered on my computer with Google Chrome:
Now, I can tell the difference, but it sometimes takes a second look or to pause slightly longer when scanning through a list.
My suggestion would be to either choose a separate color or to improve the contrast/shade. I am not much of a color person, so I can't make any specific recommendations.