Filefield v3 integration

Filefield v3 introduces an upload progress meter which in my opinion is critical for uploading large files like videos.
It provides a hook (hook_file) for other modules to use and it can be an alternative (and simpler) upload widget to the kaltura network.
A nice summary about image/filefield v3 can be found here http://www.lullabot.com/blog/filefield-and-imagefield-30-drupal-6-released.