What are your very favorite resources for enhancing teaching, learning and management?

For the last few months I have especially liked Zoho's (http://zoho.com) and Diigo (http://www.diigo.com). These are 2 robust tools. I continue to learn new things about them and am impressed with the many contributions they can make to teaching and learning. Both are also helpful in the management of files and information. Trust me; you and your students should be using both of these technologies. :)