Niner since 2011
Rasmus, thanks. I'm glad you like vs11
Jonathan, we are working on a new file picker for the scenario you describe. Broken references would be a cool addition. I've added that idea to our backlog. Thanks!!
Jesse, no, not for now. Goal is to look at all .css files in the project.
Scyonx, LESS and SASS support is coming.
Most of these features can't easily be implemented in VS2010, so I don't count on porting them to Web Essentials.