As I posted previously, the Beta2 docs are on-line. You can see them here: http://msdn2.microsoft.com/en-us/library/bb387098(VS.90).aspx
In the upper right corner of each page, there are some stars, and 'click' to rate and give feedback. I've heard that this feedback mechanism is now active, and that any comments that you supply via this mechanism will reach me.
But in any case, anyone is welcome to send feedback directly to me via this blog. I'll respond to all feedback personally, so please comment!!!