According to my Microsoft Press project editor, Advanced VBScript for Microsoft Windows Administrators, is now published. Many online sellers are slowly updating their databases. You can now order the book although I can't guarantee what the shipping situation might be. It might be 4-6 weeks before you see the book on a shelf at places like Borders or Barnes & Noble. I know I'm looking forward to going into a store and seeing my book on the shelf.
I hope you enjoy the book and ask that you post honest reviews at your favorite online bookseller. If you can post a short comment here as well, I'd appreciate it.
I'm not sure if there will be an "official" support site for the book, but feel free to post any questions about the script examples or content in the support forums at ScriptingAnswers.com. (Free registration is required to post)