There's the ability on the web to determine if a link has already been clicked on, and to display it slightly differently if it has.
You see this all the time on a page of results at google - the way a page you've already visited is purple to let you know you've been there already. This behaviour is pretty much default in fact, and too many web designers (myself included!) tend to style for links and neglect the poor a:visited property - even to prevent anything unique happening to a previously visited link. I've always thought it can spoil a design to have different coloured links all over the place with no clear indication to the user of why there's some links in blue and some links in green.
Well - Apple have just changed my mind!
They have an awesome collection of brief 'tip' videos over at
http://www.apple.com/business/theater/. You'll notice after you've watched a few that you get neat little 'ticks' to indicate which ones you've already viewed. I love this! It's really intelligent design - a clear indicator beyond 'different colour' to show where a page has been visited. So obvious when you think about it!
So I've mercilessly ripped off the idea, and the navbar on the coldcactus site now shows similar little 'tick' marks to aid user navigation. You can see a little example below - I love 'em!
