Bloggy, isn't sunrise.php a file used by several plugins? I thought it was a common piece.
Re getting your site working, was there anything non standard in your setup? I followed instructions to edit the database for a non standard setup and that is how I messed up before. I now have 6 sites up in mixed stages of completion, all working well.
I also learned to add my main user to each site or it would not show up in my list of sites even though it was there.
I hated stripping down and starting over, but it is working fine now...
I think it broke when I changed the primary site from 1 to 3...I think.