Userscripts.org

Disable the Widescreen player, usefull if you don't watch HD video's.

Extends the Width of Pages on Geocaching.com to fit better on Widescreen Displays.

Simple script to force the story text containing element on fanfiction.net & fictionpress.com to be left-aligned, massively improving readability if you use halfpage width on a widescreen display.

Hides the right hand sidebar in the message view in Gmail for an extra-wide widescreen view.

Add a few CSS rules to fix Google Reader on the center of the screen with a width of 1000px, leaving 670px for content. Also adds a few tiny esthetic tweaks to the new G+ UI.

Adapted from Wikipedia Grey Lady III by Jeremy Tan, this style displays well on all display resolutions. Further adapted to use larger fonts.

This style is adapted from Wikipedia Grey Lady III by Jeremy Tan and is best suited for displays more than 1280px wide.

View Facebook at the full width of your browser / widescreen monitor

Adjusts the appearance of photostream pages depending on the browser's window size.

Resize the width of every website by pressing Ctrl + Click and dragging.

Any webpage is converted into screen-height columns using all the screen width. Invoked by control-c or shift-middle-click. Importantly, column height is kept within current window size so no need to scroll back to top for next column. Th...

Automatically Scale YouTube ect.. to Largest Possible Size & HQ/HD Quality Video. Scroll down to read comments without missing video, more...

Properly widens VKontakte screen (supports VK.com too)

Optimizes YouTube for bigger resolutions and gives you the opportunity to hide various sections of the video playback page, disable autoplay, enable HD and download videos. All this and more can be utilized through a built-in configuration menu:

Improves the layout of the popular blog for 1440x900 screens.