Delicius is a nice web site to start but it might not be the best on a safety point of view, I will recommend to the users to have their ant virus well tuned to avoid bad surprises, 3 of the links i found like the portal to the Maya underworld from National geographic has a Trojan virus. These doesn't mean that all the tags a bad or have something wrong, just be cautious.
On the other hand Furl has a better presentation and a more easy to use navigation area; tags are really help full and more if you are in the middle of a research project even for third graders, if you teach them properly they can learn to tag or bookmark pages with the information they are looking for and be able to retrieve it later on, it can be use but requires a lot of practice and commitment, on both sides of the equation.
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