Links typically are a lighter color when un-visited, and then darker or different color when not visited.
This site is backwards and the colors of visited vs. unvisited are too close together.
Then there is the confusing aspect of some threads being bold and some not bold. I don't know what bold light blue means vs. bold dark blue or non-bold light blue vs. bold light blue. I see a bold light blue with a first unread link and a bold dark blue with a first unread link so this doesn't make much sense.

