The DOI Bookmarklet provides access to access-restricted documents by redirecting through a ProQuest EZproxy as used by many university libraries.
The DOI Bookmarklet is easily installable via the GitHub Project Page.
How it works
The bookmarklet searches the currently selected text for a DOI (beginning with doi: or hdl:) and routes the subsequent request to http://dx.doi.org through the specified proxy.
This work is free of known copyright restrictions.