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Recommended Tool for Feature-Hungry Technophiles: Diigo Diigo has everything I’ve been looking for in a great social bookmarking/collaborative research tool—except ease of use. The tagging system is still buggy (renaming a tag or deleting it can lead to unexpected results), and the interface has some usability issues that I’ve already discussed with one of Diigo’s co-founders. For instance, tag clouds only display the first 18 characters or so of each tag, preferences on how to view your tags revert to default settings every time the page refreshes, etc. Unfortunately, Diigo is still too frustrating to use for me to recommend it to non-tech-savvy educators, but I hope its shortcomings will be resolved soon. If that happens, I’ll become a major Diigo evangelist. If not, I might have to embrace a more bare-bones bookmarking tool like Del.icio.us and search for a separate tool that just handles collaborative research well. Google Notebook is next on my list of tools to check out for that.