Let me give this my admin seal of approval
Everything here is safe to download.
Just to avoid confusion sngx1275 didn't create these (not that he claimed he did, just thought I'd mention it before all the "awesome work!" comments got posted). These are called "Demos" and there is a whole "scene" of people involved in creating these - truly amazing work they do.
There's a DVD which I've seen that has some of the best of the best from "The Scene" -
www.mindcandydvd.com
Also, with the files above, when he says "newer version" he means "more recent creation"
They're NOT the same demo and therefore one should not favor getting the newer one over the older one, they are both worth it. I recommend you start with the "older" one (the first link) and be SURE you do not exit when it tells you to. Lots of cool information follows.