This is a very one sided view. One major problem that web apps have over desktop apps is the ambiguity of purpose. If you alt+tab or use exposé and see the wind

This is a very one sided view. One major problem that web apps have over desktop apps is the ambiguity of purpose. If you alt+tab or use exposé and see the window for Word, you know that's a word processor. It's much less defined as a browser window with Google Docs open. Regardless of what the web browser can do, its main purpose is still to browse the web. It's a main reason why I use Pidign/Digsby/Adium over using Meebo (although Meebo is great for checkup on someone else's computer). Different strokes for different folks. Desktop apps are also not limited within the browser window and in hardware configuration such as 3d acceleration, keyboard shortcuts, mouse clicks (right click on Flash?), etc.