I saw the InfoPath 2003 Service Pack 1 (SP-1) Preview appear on the Microsoft Download Centre RSS feed recently, and I must say it's something I'd like to have a play with.
When InfoPath first came out I was very excited, but I realised that much of the functionality is available in the (now FREE) Altova Authentic®, which has supports a browser plug-in for Internet Explorer, comes with a free Windows Client, Placeholder Control for Microsoft CMS 2002 Server, and an ASP.NET Server Control.
The flip side of the coin is that InfoPath is a dream to use, looks sexy, and supports scripting. With the addition of the InfoPath 2003 Toolkit for Visual Studio .NET it has reached a level where it can be taken quite seriously.
Anyone out there have some experience with either the VS Toolkit or the SP1 Preview that they would like to share?