I can't seem to determine which questions I've browsed to on superuser based upon the coloring of the link. As far as I can tell (maybe I'm color blind), there is no difference between the coloring of browsed and un-browsed links. In contrast, on SO/SF/META, the coloring of browsed links is pretty obvious.
Most people after a certain age (usually 40-45 years) start having problems distinguishing shades of blue. Even though we all think it looks cool, with the internet community including this age group too (and increasingly, as we all get older), color schemes based on mainly shades of blue should be avoided. Especially light blue fonts on dark blue background, but also - as is the case here - similar shades of blue to distinguish properties of the content.