http://www.youtube.com/my_videos_upload?beta
<<We're excited to unveil our new and improved video uploader. A random sample of YouTube users have already been using the beta version, but now we're inviting everybody to check out this more streamlined uploading experience. Just login to your YouTube account and click this link to opt in. The new video upload flow includes these cool features:
You can enter in your video's metadata (title, description, tags, etc.) while the upload is processing.
Upload multiple files at once, without downloading a plugin (separate progress bars will display for each file).
The file-size limit for uploads has been raised from 100MB to 1GB.>>

http://www.youtube.com/blog?entry=X--e2MeTQNs

It looks good and better then the multiple uploadfunctie now, is Gears still required for this?

(when i try to upload i see no progress, also the cancel link doens't stop the upload here, FF3)

for the beta, Gears is not required. The Multi Uploader needs Gears
http://www.youtube.com/my_videos_multiupload