In the interests of creating an Open and Editable list of Links to Revit Content, I have created a page over at the Open Revit Standards.
Let's crowd source this list and make it current, useful and informative. Head over to the link (register if you haven't already) and add any other content sites that you are aware of.
I would like to somehow implement a ranking system for these content sites, perhaps we can talk to the Open Revit Standards guys and look into this.
Credit for the original post goes to James Van:
All Things BIM: BIM Content for Revit