Highlights external links on any page with a helpful icon so you always know when you're about to leave a page, and have some idea of where you're going.

A script to add favicons next to posted links on delicious.com

Replace the ugly .ico with a nifty .png icon.

Very simple script which adds the favicon of the site linked to, to on external site links. Disabled for gmail.

Adds favicons to feeds and entries

Brings back the old 'classic' Google favicon.

Alerts you to the status of your Gmail Inbox through distinct FavIcons.

Automatically decorates the Google Reader subscription list with icons corresponding to the website from which each feed originates. This replicates an effect currently available in other feed-readers such as Bloglines.

Changes colors and images on facebook to a UA theme

change twitter favicon to user icon

Changes the tab and address bar icon ("favicon") for Last.fm based on your colour setting (red or black)

Changes the site icon for any site

All The Web is a Wabbit.

Updates the "Favorites Icon" for the tab in which Gmail is loaded when you have new mail or new chat messages.

Sets a favicon for Campfire, to make those tabs easier to spot.

Any image in an anchor on angadi.org will be rewritten (and displayed) as a IMG tag. Also adds the comics Diesel Sweeties, UserFriendly, and a fixed Calvin and Hobbes. By William Rawls and Alan Hogan

Floating Thumbnail Image Preview of Links on any Web Page on Mouseover.

Changes makeupalley.com icon & title to be discreet at work

Puts a favicon to elxdraco.net, a popular hl-engine scripting site.

Sets a thumbnail of the gallery item as the favicon for the deviation page. If used together with my DeviantArt title fixer script, you might want to uncomment the line for a shorter prefix (added recently), in that script.

Makes Userscripts.org's favicon less ugly