You guys are silly. Why big movies? Don't forget to mention small movies. Anyway, big movies is one way of doing it. But what about the tons of webmasters making a killing on small movies (7-10 seconds each).
Lock, big movies are fine are if you plan to submit to sites that accept big movies. There's a handful of great reputable sites that accept them; vidsvidsvids.com, fuckingfreemovies.com, etc.
Then there's the movies sites that prefer small movies on galleries; video-post.com (i believe), onlymovies.com, etc. Keep in the mind that with small movies, you can also get listed on regular TGP's as well. Don't just limit yourself to posting on movie sites. Most TGP's from what i understand won't accept big movies. But don't quote me on that, each are different with their rules.
The key is to try both types of movie galleries and see which you do better with. Some people are great at 3 huge movies on galleries, while others prefer 6-8 small movies on galleries.
Also, this might be worth a read to you:
'The Debate - Big vs Small movies on galleries'
http://thinkreel.com/showthread.php?threadid=81
Good luck