Just read the SLRC newsletter and Enoch Pratt is working on creating del.icio.us sites for each of their Subject and How-To Guides. Here is the main network page (http://del.icio.us/network/epflslrc_hum). You can see all the epflslrc links on the right side, one for each department participating. Click around and see what they are up to.
Also found this cool blog post where someone is attempting to keep track of what libraries are using del.icio.us and how. I'm going to add this link to the Exploration since it provides a variety of usage ideas.