Heavens Gate

In China.  Beautiful

Free online education

A fairly comprehensive list of free, online courework and other educational resources
In addition to the existing MIT site listed, a new program, MITx, has just been announced.

Clock of the Long Now

Good summary article on how the Clock of the Long Now works.  This clock is designed to run for 10,000 and is being built in Texas.

NYTimes Computer Hisotry Timeline

Participatory timeline of the history and future of computing.  Make predictions on what the future holds.

Timescape

We live on a pretty cool planet, and thankfully, there are talented people to capture the amazing images.  A preview of Timescapes.

The Internet of Things: Streaming Data

Pachube is a site that allows users to stream data to and collect data from the site in real time.  Examples include sensors for radiation, temperature, and light level.  Often, microcontrollers like the Arduino are used to collect and transmit data.  The site offers are rich API along with online tools such as visualization and mapping.  Not sure exactly what I could use it for, but seems interesting.