Colours of 'visited links' vs 'non-visited links'

Any chance of a slight change to the stylesheet to show a slight differentiation in the forum between 'visited links' and 'non-visited links'?

It would help to tell at a glance what posts we've visited before and what we haven't — so we can either go back to follow up on the ones we've already read, or so we can opt to read the new ones instead...