TidBITS Electronic Publishing has announced “Take Control of Upgrading to Panther,” an electronic book written by long-time Macintosh expert Joe Kissell. The US$5 ebook will be available for purchase at 8:00 p.m. ET this evening as Apple takes the wraps off Panther at Apple Stores throughout the United States. “Take Control of Upgrading to Panther” walks users through the necessary steps to take before installing, choosing the right installation options, and more. The ebook also offers detailed troubleshooting tips for common problems, instructions on how to downgrade to a previous system if necessary, and a collection of direct links to software update sites for many common devices and utilities.