I saw this great article, Tipping the Scale (Why the UI, Part 5), concerning the level of complexity when using the, now, old menu-toolbar paradigm. This has been used and worked well ever since it was introduced in the late 70's and went mainstream during the 80's.The article is of course in the light of what’s to come in office 2007. But I think it applies to a lot of other applications as well, especially if you look at what can be done to FireFox. Also recomended reading at Jeff Atwoods Cooding HorrorThere is a great need for us usability knowledgeable to start thinking in new directions. The new supplied development frameworks now more than ever supports free thinking now the responsibility is with us. Be creative and make sure to know your users.