InfoPath Dev

Microsoft

Microsoft Office InfoPath:
InfoPath Home
InfoPath 2007 / InfoPath 2003 SP2 Update
InfoPath 2007 Managed Code Object Model
Developing InfoPath 2007 Managed-Code Solutions
InfoPath 2003-Compatible Managed Code Object Model
InfoPath Managed Code External Automation Object Model
COM and Scripting Object Model
Microsoft Office Forms Server 2007 Automation Object Model
XmlFormView Control Object Model
InfoPath 2007 XSF Schema Reference
InfoPath Developer Reference for Managed Code
InfoPath Developer Reference for Managed Code
InfoPath SDK
InfoPath Toolkit for Visual Studio .NET
Microsoft Office Forms Server 2007 SDK
InfoPath Training Courses
InfoPath Developer Center Tools & Code Samples
InfoPath 2003 Support Center
Microsoft Office InfoPath 2003 Assistance

Microsoft Office SharePoint:
Microsoft Office SharePoint Server 2007 products comparison download

Office Training Videos:
2007 Office System Video: Enterprise Content Management

MSDN Developer Center:
Understanding InfoPath

MSDN Library:
Microsoft Office InfoPath 2007
Microsoft Office InfoPath 2003

InfoPath Webcasts:
Microsoft Office Developer Center: InfoPath Multimedia

Online Communities

Blogs:
InfoPath Team Blog
InfoPath Tips and Tricks
Pashman's InfoPath Goldmine
The Sharepoint Factory
Jan Tielens' Bloggings

Newsgroups:
Microsoft.Public.InfoPath  (news reader)
Microsoft.Public.InfoPath  (browser)
Microsoft.Public.InfoPath (Google Groups search)
Microsoft.Public.InfoPath (Microsoft search)
Yahoo InfoPath Group

Development Tools

Fiddler - HTTP debugging proxy for inspecting and logging all HTTP traffic between your computer and the Internet.
soapui - Desktop application for inspecting, invoking and testing (functional and load) of Web services over HTTP.

Web Form Conversion

InfoView (Unique World Software)
InfoScope (.NETXPERT)
InfoJet Service (InfoJetSoft)
Web Connector (ADeP), Language: French