"Remove sticky" is a must have on the modern web. Probably my most used bookmarklet.

A couple of others I use frequently:

Go to referrer. This fixes an infuriating missing feature in browsers, where links opened in new tabs lose their history (why?). Often this workaround will work:

    javascript:if(!document.referrer)%20alert(%22No%20referrer!%22);%20else%20document.location%20=%20document.referrer;%20void%200

Open in wayback machine. For when you follow a link and there's nothing there anymore.

    javascript:{var%20url=location.href;void(window.open("http://wayback.archive.org/web/*/"+url));}