Scott and Hagen, from the InfoPath team, have a great overview of what's new and interesting in the following MSDN article: InfoPath 2007: Designing Form Templates With The New Features Of InfoPath -- MSDN Magazine, August 2006
Other good news is at the bottom of the article: Scott and Hagen are co-authors of an upcoming Addison-Wesley book on InfoPath 2007: Designing Forms with Microsoft Office InfoPath 2007.
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