I found this comment by Roger Jennings to my previous post about the InfoPath 2003 SP-1 Preview and Toolkit for Visual Studio .Net, and wanted to share it:

I've been working with InfoPath since the Office System 2003 beta. My only complaint (as a long-time Visual Basic programmer) was that the devs used JScript behind the sample forms.

The InfoPath 2003 SP-1 Preview and Toolkit for Visual Studio .NET are major milestones. Integration of InfoPath with VS.NET is seamless.

I've posted some examples of InfoPath SP-1 Visual Basic .NET managed code projects at http://www.oakleaf.ws/infopath/
. Check them out.

It looks like Roger has some great resources there... the examples are for his upcoming book on InfoPath.