For those better in the know then I am, Fluid.app might be quite old news. I however just got on the bandwagon recently, and I thoroughly enjoy it. Fluid is a Mac OS X application, which acknowledges the fact that we are not using "the browser" anymore, but we are working on our days jobs, using our private email, posting photos, chatting with friends, etc. And these are all distinct activities or tasks we do. So we would be more comfortable looking for our "photo app", "chat app", "email app" or even "work app", but most of our interactions are now done on the web, so all these are tucked under the "browser app".