I have a great list of 2.0 tools that can be used with an Essentials Course. I'll have to put them in one place and share them..
In the meanwhile, here is a great list of 2.0 tools that was shared at ISTE10. A couple are not very usable for Essentials, but the remainder of the list if very stout!!!
Here is a collection of Web 2.0 tools and resources that I learned about some of my Twitter followers that were tweeted out from Bloggers Cafe and the Social Butterfly Lounge.
100 Informative & Inspiring YouTube Videos for Educators http://bit.ly/bjIRAG
100 Helpful Web Tools for Every Kind of Learner: http://tinyurl.com/r3bf2u
Code of best practices in copyright literacy http://bit.ly/bOiM2Z
ISTE's new professional development site - http://istelearning.org/Levels of Technology Integration Matrix http://bit.ly/eZaQ (I use this in most of my trainings)Multimedia training videos http://www.multimediatrainingvideos.com/studentvideos.html
Show visual representations wtih Google Gadgets - http://edgecombe2point0.blogspot.com