After further thinking, it appears that the 8800's screen is 320x240 (whole screen, hence sort of true and OK for marketing). Sixty total pixels appear to be used for borders/controls at top and bottom in the media player. This leaves 180 pixels vertically for videos. On these assumptions, the correct sizes for 8800 videos are 16:9 - 320x180 and 4:3 - 240x180.
BES (version unknown)
Windows XP, Ubuntu 8.10