I have been resisting signing up to StumbleUpon due to productivity reasons. I caved earlier in the week. There is some really cool stuff out there! If you have not used it and don’t mind losing a few hours I recommend signing up.
Along a similar fashion for a bit of fun I have also installed Matt Mullenweg’s random redirect plugin. It is now in the sidebar of the home page and in the INTERACT section of a single post. A great way of discovering old posts!
Visit a random page!