Very interesting and useful site with a wealth of information about time, date, moonrise/sunset, timezones, etc.

A really cool site with essays about interesting things that happened in the past.

Damn interesting...

Another interesting "map it yourself" service.

A very neat system, like Google Maps, that allows users to "create their own maps."

This is Microsoft's answer to Google Maps.

It is pretty darn good, especially the low-altitude "3-D" aerial images.

Very kewl.

It is a scanned library of original rare books and manuscripts. You can read Gallileo's first printed books, or view Blake's picture books as they were first published.

This is a very kewl AJAX interface to Wikipedia. It looks up entires as you type them, and helps you to quickly find pages.

The whole thing online. For free. Cool.

A VERY major work of transcribed Catholic literature and canon. If you are a Catholic, you'll really like this one.

This is a very interesting project that attempts to present the entire taxonomy and philogeny of life on Earth. It's a big job, and they've just started, but the results are quite interesting.