Use Front Row.
I setup my Movies Drive with Genre Folders (Action, Comedy, Drama, Horror, Thriller, Suspense, Romantic Comedy, etc.)
In each of those I setup Alphabetical Folders...I have about 320 Movies so I did a folder for A-E, F-J, and so on.
Then I drag the appropriate movies into those folders.
Now make an alias of the Drive or Folder, so for me I right-clicked (ctrl+click) on the Movies Drive, and select 'Make Alias' from the menu.
I drag that alias to the Movie directory in my Home area.
Now in Front Row you can navigat to Movies, Movies Alias, Comedy, F-J, and see theh movies there and the preview.
You can also use iTunes to archive them, and select the cover art, but it makes itunes very slow.
Brian