Delicious

I enjoyed revisiting my delicious account, which I must confess hasn't been updated for quite a while.

Looking through the features I really like the ability to link with Twitter so that you can add to the delicious account while tweeting.
The bundling feature is also great as I prefer things to be well organised and the bundles allow this to occur.

I would suggest using delicious to create links for specific focus groups e.g. an account dedicated to family history research links, or an account of links on children's literacy that could be made available on a library website to share resources with patrons.