Lifehacker's "Better" add-ons, compiling multiple Greasemonkey tweaks for YouTube, Reader, Gmail, Google Calendar, Flickr, and other sites.
Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.
Enhance Flickr with a compilation of useful Greasemonkey scripts.
A compilation of some of the best Greasemonkey user scripts for YouTube in one interface.
Add useful extra features to Google Reader, like feed favicons, inline article previews, and unread counts in your browser tab with Better GReader.