I spent a large part of my weekend reading through some of the information and links from e-panorama. This site is a great resource for learning about the electronics necessary for hooking up motors in electronic circuits.

I really like this site. They have a great selection of documentary videos, that appear to be updated regularly. There are also links and essays that I have not explored yet.

Their aims seem to be similar to the original L5 group in that they are promoting space colonization, however they seem to be different from the original L5 group. Further more, they seem to be defunct - with the most recent additions to the site having been undertaken in 2003.

While not nearly as cool as Charlie's Great Glass Elevator, the Space Elevator has generated quite a bit of attention. The linked page has collected quite a bit of research on the topic and is pretty good read to those interested in the idea.