This is Drat Glider, its as far as I know the first or one of the first all lego gliders. While it cannot achieve true flight, it can glide for about 18.5ft. The blue material on the wings are the "solar panels" from the lego mars rover set: #7471, its an slightly see through flexible plastic. I plan on eventually making better versions, my goal is to achive a flight distance of 50ft with the final version. The CAD file includes everything you need, minus the lego parts, its zipped so you will need winzip or something like it to open the file. The two movies try to show it in flight, the only problem is that it moves to fast for the Lego Vision Command cammera to capture affectivly.
For a long time people have been wanting to make Lego fly, there have been many discussions about it on all the major Lego related sites. I know almost as soon as the official Mindstorms Site was up people started talking about it. I used to think it was impossible, however then Lego came out with the Mars Exploration Rover Set, and it came with blue panels that turned out to work very well as wings. And now we have a working Lego glider :) Lego also gave this glider special mention. If you go here: Drat Glider you can view larger pictures of this invention, just click on the sliding pictures on the page.
Wow i was surprised first time i saw i't fly, it's actully working. And i tried to make a helicopter out of lego... and yes, i't didnt go so well as this. I also saw it before i saw it here, i saw it on your site. I'ts a very cool site!