I've had my diy slider sitting around for a while unused so I finally pulled it out and put it together and shot some footage. Still need a stronger tripod head, but it works great.
http://e1.video.blip.tv/1020005858134/Horner218-tischerslider112.mov
http://e1.video.blip.tv/1020005858134/Horner218-tischerslider112.mov