I really liked the Encore tag clouds. I think it helps you think of other terms that are related, especially if you are narrowing down a topic, or not quite sure what to call the topic. I think that it could help a patron be a little more specific (or broad) with their search.
del.icio.us is an interesting tool. I don't use it now, but I can really see a good use for research purposes and teaching purposes. I think that teachers can set up a good network of sites that are useful and not necessarily have to find them all by themselves. They can also help students do the same for their particular topic for assignments.
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