Most people who love to post these high speedtest numbers are people who's provider runs a speedtest server. Ok, so you can get that speed to their central office. Big deal, I get those speeds to our speedtest server at work... because it is down the hall from me.
A real speed test involves going off network and a good distance away. I generally test to FastServ Networks in California because they have a solid network on their test server, it is off my ISP (at home and at work) and in a different state. If my speed is good to them, I can confidently say my Internet connection is fast: I have a good uplink all the way to the outside world, off my network.
Also there is the question of congestion, or rather lack of it. I can't imagine Google is doing point-to-point fiber. It is probably GPON. That means the more subscribers in an area, the less speed.
I just question his gushing a bit because at work, I have "gigabit" speeds. I'm on a gig link, to a 10gig building link to our central systems. I'm not sure what our total off campus speed is, it's around 2gig to the Internet, 10gig to I2, but I haven't looked. Speedtests to FastServ show about 400mbits up and down generally during the work day. Downloads are nice and zippy, a Linux torrent just screams, and we have Akamai cache engines on the network so things like Windows updates are almost wire speed.
However for all that, I don't notice much difference over my home network, which is about 30mbit. I do for big downloads, of course, but not for general browsing. The speed of page loads seems to be limited mostly by rendering all the javascript and DHTML they use these days, not by the line, and I can stream whatever I like with no issues.