I found two more cool InfoPath resources.
Shoutout to Christopher White, who has a couple code-intensive InfoPath-SharePoint articles in his blog. Particularly interesting:
1) Walkthrough on setting up a pretty complex workflow using InfoPath and Office Server 2007.
2) Post on manipulating file attachments in С#.
Kudos to S.Y.M. Wong-A-Ton, who wrote a number of walkthroughs, mainly for the InfoPath client. Highlight: article on using custom XSLT with secondary data sources.
Alex WeinsteinProgram Manager