>I believe that most business users embrace the browser front-end because ... it gives them an enjoyable user experience.

Can you explain that a little more?

In your latest web app (with the rich UI), which browsers did it run on? If it was multiple, did you need any browser specific code for it? Which OS's would those browsers run on? Do you think that you provided a UI as powerful and seamless as one could build with a Win32 app?