I decided to whip up a quick archive that has (nearly) every beta TFE screenshot that was on Croteam's website in 2000 and 2001. I figure some of you have already seen these images, but it should be a nice intro to the TFE beta for the rest of us. This is mainly so people don't have to go on an internet easter egg hunt to find a most of the TFE beta images.
The meat of this archive are the images from a deleted section on Croteam's website that talked about Serious Engine 1's features. I've also added the images from the removed "art" section and some similar images found on Gamespot's website.
Download here: http://www.mediafire.com/?owsq13zcihc95qd