720 x 480 or 720 x 486 are the proper sizes for NTSC broadcast quality video. I always render to the former when i do animations in Truespace. (I haven't really done any animation in poser.) As said by the other guys render to either an uncompressed series of images or an uncompressed Avi, then edit it together for final compression in your video editing software. Another great solution for video output is DV. If you have a DV video camera and a firewire card you can copy your edited video out to DV tape at 100% quality, then you are free to make whatever analog VHS or SVHS copies you need from that. DV doesn't require quite as much speed from your comp or Hard drive as analog video output does.