I like del.icio.us a lot as a way to manage and tag websites--we have one for the department, and I keep a separate one for my teaching and research. One of the limitations has been finding the sites of other people in your same profession so that you can peruse what they are interested in. So far I've not been too successful stumbling across many political science sites, but educators, primary and secondary, are further along in this regard--if you're a teacher, interested in technology and/or education, check out the overview of these sites at Teaching Hacks.com
If you've got a del.icio.us site, send it along and I'll add it to our network.
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