What I got working last night:
I have two blogs, a “main” and a “test” one. Each has seperate tables and templates. I can display the weblog fine, dig down into categories and posts too. I haven’t tried commenting on a story yet.
All this is achieved without symlinking any files in the “wp-blogs/main” or “wp-blogs/test” directories!
Unfortunately, I haven’t been able to display the backend reliably yet. It’s a matter of writing the correct mod_rewrite rules I’m sure but that’s a pain and takes a lot of trial and error in my experience.
So, yes, still on track for an alpha-release next week! 🙂