These technologies make you think about how you were living without them. So naturally efficient.
and that my friend is the essence of a killer app. Although, I wouldn't classify Ubioquity as such right at this point, but it has the potential to become one. For techies and pseudo-techies, I can see this already affecting the way they surf the web... for the mainstream though, the options available for various online artifacts and their associated commands need to be a little more seamless.