I just came across two great InfoPath resources:
- A series of articles by Christopher Domino (12 detailed articles so far!). Christopher's articles look deeply into many InfoPath aspects, from "declarative logic vs code", deployment approaches, and backend integration discussions to detailed code dive-ins. Highly recommended.
- CodeProject.com has a few interesting InfoPath articles; I particularly liked their review of the Logic Inspector (new InfoPath 2007 feature that offers an easy way to debug form logic) and the walkthrough on how to invoke BizTalk orchestrations using InfoPath.