The data you see above comes from a Derby (Java DB) database. When you click Add, you get the dialog box described in GUI Building in NetBeans IDE 5.0:
And, because the tutorial makes use of a technique described by John in Swing Tutorial in Matisse - Custom Table Models, I can even see the live data in my database before deploying the application, while it is in design mode:
So, at around about the time that Talley releases his tutorial, I'll be releasing a NetBeans Platform tutorial that outlines the same subject, but from a NetBeans Platform perspective. It's pretty cool to finally have an application, with its own executable, that connects to a database. And really cool that creating applications on the NetBeans Platform requires the same basic skills as creating any other Swing application. Of course, the benefit is that now that the application is on the NetBeans Platform, adding additional functionality to it is as easy as adding modules to NetBeans IDE. The Update Center wizard rocks.