Learnist makes it easy to share what you know by curating the web. You can use videos, blogs, books, docs, images or anything on the web to explain anything.
New on the list last year, Learnist drops 10 places this year
Comments from some of those who selected Learnist as one of their top tools
Easy to create a list of resources for students to work through, and mark when done, 2013
I use it to store links to materials for later reading, 2013