@Chashuv: I imagine it'll be a 1-1 system. It doesn't matter who is calling the person, it'll always be using the same number. Google will basically have a number for everyone. It's pretty genius.
I loved this, and just now learned about fstoppers.
I've been saying this kind of thing to all my friends when they look for cameras, but they never believe me. A lot of the prints I sale are OLD from my first point and shoot, not from my 40D with L glass. Only photographers care about how sharp the image is on a pixel peeper level.