This is a note of warning for anyone who downloads the unstable version tomorrow or later after I've checked in my latest changes.
The layout of the site will changes. Gone is the "wp-inst" directory thanks to a heavily stripped down .htaccess from Ryan Boren.
I've tested it using hostnames and directories, in the root directory and not and "it has worked for me".
I will copy today's zip/tarball out of the way so that will be accessible if people want it, but it will disappear within a few days.