Well...Something like that has returned. Let the time wasting clicking resume...

Visit Stumbleupon.com and download their browser extention. You do have to sign up (though it is free) and register a few high level topics of interest. Once you do this, you will have a new browser button that you can click whenever you get bored and perhaps find an interesting site you never would have found otherwise.

I'll post a few sites that I have "stumbled upon" here when something is really cool to me.