I'm a big fan of the new Borland Turbo line; if you are thinking of doing MS Windows GUI development, you should absolutely give the free versions a try and see if it's something you like.
I find few that the Rapid Application Development stuff in Borland's tools is a great way to brainstorm.
If you decide to really use the tools - you will probably want to upgrade to the pro version, because only the pro version let's you install 3rd party components, which to me is the nicest aspect of delphi/c++ builder.
ps. I wonder if even people who don't reall consider themselves coders might consider using the free version just as a graphic user interface sketch system, without ever writing any back-end code. Be a nice way to design a mock up interface as a way of explaining what you want to a coder..