When I need a break and want to be entertained, I use StumbleUpon to relax and unwind. I normally don't like to install toolbars (except for the Google Toolbar of course), but this is the exception.
You start by selecting categories of interest. From there, you click to get a random site. You tell StumbleUpon whether you like the site, or not, and it intuitively sends you more of what you like and less of what you nix.
I have found some incredibly interesting and fun sites doing this.
I would like to credit another Google Answers Researcher for passing this along, but I don't remember which one posted it first (sorry), in any event --I've been amused and entertained for weeks now.