While on the subject of SharePoint Developer and ASP.NET Web Parts, there are two great books on SharePoint development that I've been hearing very good things about lately.  The first book is Todd Bleeker's "Developer's Guide to the Windows SharePoint Services v3 Platform" which has a 5 star rating (out of 5) on Amazon after 11 reviews, and which has been burning up the Amazon most popular lists the last few months:

Figure 1

The second book is Darren Neimke's "ASP.NET 2.0 Web Parts in Action: Building Dynamic Web Portals" which provides a great way to learn how to build sites that use ASP.NET 2.0 Web Parts, as well as how to build custom Web Parts of your own:

Figure 2

The beauty of web parts is that with ASP.NET 2.0 you can now build ones that can work and be customized by end-users within any ASP.NET web site/application (no SharePoint required), as well as have these same web parts work and run within SharePoint 2007 (both the free Windows SharePoint Services edition as well as the Microsoft Office SharePoint Server version).  This provides a tremendous amount of developer power, and opens up a lot of options.