The German Groove book “Microsoft Office Groove 2007 – Das Handbuch” will be published by Microsoft Press in December. It has been available for preorder from Amazon.de for some time now.
The book covers just about every aspect of Groove, ranging from client installation to setup of workspaces and creation of custom forms tools to installation of a Groove testlab using Groove servers (mainly Manager and Relay). It also has an extensive index which makes it a powerful reference guide.
Helmut Reinke, myself (Andreas Strothmann) and Dirk Diestelhorst (who’s replacing Christian Schräder) are the authors of this book.
For more information, please check out my German entry on the subject, leave a comment or email me.