Jakob Nielsen and flash UI

Everyone should agree, that UI (user interface) is a crucial part of most applications. It interacts with user. It makes user like or hate our programs. It is obvious, that no UI interface can be nice and convenient for everyone. But if you wish to get close to that, you should consider reading Jakob Nielsen thoughts here.
For me, of course, articles concerning flash are most interesting:
Flash: 99% Bad
Flash and Web-Based Applications