User interface design
Recently I've spent quite a lot of time looking at how users actualy use a website, where the mouse goes, what the eye scans etc.
It has also been interesting comparing how users with a mouse work differently to those with a trackpad. So as a bit of "Friday fun" have a look at this experimental web site that I bookmarked some time ago.
[warning: this will either inspire you to throw the mouse away or to throw it at the screen.]