I have been thinking of using Del.icio.us as a group work tool and suggested to my intern to give it a try. He is investigating blogs and Relay For Life with a few key volunteers. We discussed the feasibility of setting up an obscure tag that only people involved in the project would know to look for. He settled on relayblogproject. I love that I can use the tag to see what he has been investigating, and I now tag things for him to look at as well.