I found this much higher-quality Quicktime trailer, that seems to be a copy of the internal workprint with time signatures and “Do Not Duplicate” warning. Oh, well!
hhgttg_high.mov (7.8MB, Quicktime)
My bandwidth was already hammered this month, so you can thank Greg Knauss for hosting the video.
February 18, 2004: Here’s a much better copy of the official trailer, available for download.