my personal favorites are the following (the links are the actual code so you can just drag them to your toolbar):
- supercharged gmailthis – does what the name implies, gmails pages to people.
- remove bloat – stops all script on a page.
- bug me not – supplies login names and passwords for sites that you don’t really want to provide your actual stuff to.
- google site search
- tinyURL – automatically makes a tinyURL for the site you are on.