i'm gonna keep re-posting this so other ppl can at least get to their old dashboard....
same here...what's a global dashboard? i'm surprised they didn't post a notice saying that some of the features will change...plus, my "view site" button takes me back to my dashboard instead of my live blog.
however, i find that after you sign in, you can type your blog url in the same browser you signed on with, and type: "wp-admin/", you can go back to the old dashboard.
for example: http://thespeakerscorner.wordpress.com/wp-admin/