This one is for students at the University of Toronto: the following bookmarklet prepends the string
http://myaccess.library.utoronto.ca/login?url= to the current URL. This is useful whenever you are trying to access some journal article via the publisher's website, but hit a paywall. Instead of venturing to library.utoronto.ca to use their abysmal search tool to get a link to the paper that's already in front of you, just use this bookmarklet. After asking for your UTORid and auto-redirecting several times, the myaccess server will bring you directly to the article you were just looking at. Well, most of the time it will.