Script Summary: Removes ads, allows downloading and resizing videos, displaying all comments on video page, etc.
Several usability improvements for YouTube.com.
This script allows downloading videos (title link), removes ads (including junk "director videos" and "New on YouTube"), allows resizing videos, expands description and tags automatically and retrieves all comments.
You can configure a default video size, maximum number of comments to retrieve (default 500) and if you want to expand description at the top of the script.
Please rate this script if use it so I know you are interested in updates if they change the design.