Simply Delicious

Del.icio.us Social Bookmarking
I've just discovered Del.icio.us and I'm impressed! I've used it to create a list of websites related to family history research.
I think this tool would be of great benefit with relation to reference work. I can envisage Del.icio.us being used at our reference desks to aid staff with access to appropriate websites for those "curly" reference questions.