I am an absolute newbie to Poser -- have had it for two days now -- but worked some with Hash's AM before (with great frustration -- anyone looking for a mac version cheap?) and one of the first things I tried in Poser 4 was importing a quicktime movie and a still image as a background and it worked absolutely beautiful. Having it up all the time slows down the process (I suspect it takes up a lot of memory to use a video movie as a background), but it's needed on and off to align the action. I made sure the movie was 720x480 (DV specs) and the Poser window actually jumped to the larger size when I brought it in. It rendered out perfectly (make sure your quicktime movie options are set to DV Ntsc, best quality, and all that), took one small section of the original backround (in which a car passed closely in front of the camera) and rendered it out as a "still sequence" and cut and pasted the car until it passed in front of the poser figure. Worked great. Now if I can just learn how to animate a smooth dinosaur.... question is -- can you composite Poser footage over video footage AFTER exporting it -- like with an alpha matte???