Ari Bader-Natal has created a free AppleScript which converts the frontmost movie in Quicktime Player into an iPod-readable video.

Requirements:
• iTunes 6
• QuickTime Player 7.0.3+ (for OS X 10.4+)
• QuickTime Player 6.5.3+ (for OS X 10.2.8+)
Note that Quicktime Pro is not required.

Installation: Double-click to untar the file, then move the resulting script (Export front movie to iTunes.scpt) into ~/Library/Scripts/Applications/Quicktime Player/ (create these folders as needed.) (If you do not see a scripts menu in the top-right section of your menu-bar, you can install it by running the built-in “AppleScript Utility” program in the “AppleScript” folder of the “Applications” folder. Just check the “Show Script Menu in menu bar” button.)

To use: With your movie frontmost in QuickTime Player, open the Scripts Menu and select Applications>QuickTime Player>”Export front movie to iTunes.” The script will export the frontmost movies in QuickTime Player to an iPod-friendly video format, import it into your iTunes Library (and Videos playlist), and play it for you. Next time you sync your video-capable iPod, your movies will be viewable on the iPod.

More info and download line here.

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Related article:
Podner will reformat your movie collection for Apple iPod and iTunes – October 27, 2005
Using QuickTime Pro to create videos for playback in new Apple iPods – October 13, 2005