Archenemys might not be making new videos, but they do still have the old ones available. The quicksand DVDs are at
http://www.archenemys.com/Videos.htm , and a downloadable video webpage at
http://www.archenemysvideo.com (you need to be a member to get access to the downloadable videos).
Each DVD has its own brief preview video. They are on the archenemyvideo site as well though I find it slightly harder to navigate.
I've never seen any full-length archenemys videos, just brief trailers.