Userscripts.org

Instead of showing a user's home page first, show their videos page

Enhances your pirating experience by adding torrent links to iMDB, Rotten Tomatoes, TVMuse (and MovieFone, soon).

Prevent playlists from automatically looping

Automatically scrolls to the vido on load

Automatically pauses the video when you switch to a different tab or window, and automatically plays when you come back to it

Adds the national flag icons next to each username in the comment section of Youtube.

Adds a 'Stop Video' button below the video

Click on a user's YouTube thumbnail to enlarge. Clickable thumbnails will glow in a blue outline

Automatically "likes" videos from users you choose, or anybody.

A script to add an rss feed button to youtube videos.

Adds a button that redirects to KeepVid's YouTube download service for the video you are currently watching.

Adds a menu under YouTube video with available MP3 files found on ZippyShare and Hulkshare.

Make the YouTube dislike bar red again.

Hides comments, preserves brain cells. Click headers to toggle.

Removes main youtube ads, does not remove in-video ads.

Skips the das captcha page on YouTube

Schnell navigieren in der Zeitleiste.

Completely removes the annoying gray playlist at the bottom of YouTube. (In opposition to just hiding it.)

By Theofilaktos Spendas, this script Clicks the youtube Like button on visit of a youtube video

Well It Changes The Look of Animecrazy And Moves Some Links Just started this Project

Removes the "Your Subscriptions" quicklist footer at the bottom of the page in Youtube when watching videos.

Adds FLV, MP4, 3GP, and 720p download links to YouTube.

Makes youtube in HD.

Creates links under embedded youtube videos and shows thumbnails when hovered over

Uses the JW Player for youtube. Has options in the user script commands

Pops up a confirmation box before you leave a page so you don't accidentally leave a video you're watching

Turns text fields into a nice, tag appropriate field separated by commas using ctrl+alt+c

Several customizable options. Special support for Userscripts.org (new interface, fix for pre tags, and allows you to hide the install warning box and footer) Changes text fields, buttons, links, selects, and text areas.

200% YouTube video size.

Adds a set of links on small images.