The Firefox extension, LibX looks like a very useful tool.
LibX is a Firefox extension that provides direct access to your library's resources.LibX is open source.LibX is a framework from which editions for specific libraries can easily be created.
It recognizes, CrossRef DOIs, ISBNs, and ISSNs, and PubMed IDs. Has OpenURL support, including COinS. Supports off-site access. Can be customized for your institution. This is one I'll have to download and try.Noticed on Outgoing.