Browser Progress Bar is an Anti-pattern - The user initiates a navigation, and the browser gets busy: it'll likely have to resolve a dozen DNS names, establish an even larger number of connection...
As the rumor says, it is obvious that Apple is developing next OSX. 3D environment is the critical difference. Bumptop desktop could be similar with it. Trends are really clear. Wiimote, Jeff Han's Ted demo, and Ubuntu Compiz fusion. The new era of HCI has come. But there're little apps which are appropriate with these environments. Adobe launched AIR, and it is still early for general users. But it is certain that adoptions are growing.
Now, we see java 3d OS. Where is shining, rich ruby desktop environment! Do we need to learn Air to mimic 3d actions?