Tom’s Greasemonkey script turns any seven-syllable headline into a verse of Camptown Races.
A greasemonkey-driven hypertext game: get from a starting Wikipedia page to your target solely by following links in the articles.
Microformats + Greasemonkey = Monkeyformats. Is there a site that you wish used microformats? Write a userscript and share it here.
A greasemonkey script that allows you to call telephone numbers in web pages (marked up with hcard) using Skype.
A Greasemonkey version of my zoom layout bookmarklet. Great stuff!