Platform specific / Site Specific Browsers are going to be immensely useful.  I'm a little sad to see this fall of the main page with so few votes/comments...  Having developed two medium to large desktop applications using XULRunner, I can say that there is massive room for improvement here.<p>Using Todd's Fluid.app SSB generator, I was able to create a menu item that displayed an appropriate window with the letsfreckle.com timer as a small popup bound to a hotkey.  The more you think about that, the more powerful it should sound.  Can I do that in XULRunner?  Sure (maybe... it has Windows SysTray at least).  Fluid.app took a half hour, XULRunner would have taken all day.  Google Chrome is supposed to have something similar, but not for Mac, which supports the platform specific strategy.  I don't need one framework that works everywhere, as long as each platform specific framework has the same general API exposed.<p>So, rock on Todd, I'll be using Fluidium soon.