http://www.fiftythree.org/etherkiller/ The Etherkiller's homepage: one end plugs in the wall, the other your Ethernet card.
http://www.innocentive.com/ Innocentive is a site for businesses to offer rewards for solutions and for scientists to search for problems so they can try and find a solution.
Gil's LotD (Link of the Day) publishes a link to a web page every day. The linked pages are chosen for their interesting, informative or entertaining content. You can read Gil's LotD on the web or in a daily email.