Web 2.0: Apps for the well-organized student

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Web 2.0: Apps for the well-organized student - pencils.png
Read/WriteWeb has created a list of their top web applications for students - but honestly, anyone who wants to be more organized could benefit from this list.
Many of these have been featured here at Lifehacker central; however, I really like how this list is organized into specific categories: office replacements, taking notes, mind mapping, studying, bookmarking, collaboration, calendars, calculators, and more. Do you see anything missing from this list? Let's hear it in the comments.

[LifeHacker]

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