Hmm... nobody mentioned the Lifehacker posts yet?
This one is from April 2007:
http://lifehacker.com/software/greasemonkey/lh-top-10-greasemonkey-user-scripts-249957.phpThis one is also from April 2007:
http://lifehacker.com/250819/ten-more-useful-greasemonkey-scriptsAnd this one is from December 2005:
http://lifehacker.com/software/geek-to-live/geek-to-live-my-favorite-greasemonkey-user-scripts-143499.phpMany of the scripts are still useful, though.
Searching through the posts tagged "Greasemonkey" also turns up many useful scripts.
http://lifehacker.com/tag/greasemonkey/My personal favorite and most useful is YousableTubeFix.
http://userscripts.org/scripts/show/13333From the script's page: Removes ads and unwanted sections (configurable), allows downloading and resizing videos, displays all comments on video page, expands the description, can prevent autoplay and autodownload, adds a HD (High Definition) select, etc...