Although the idea looks cool and I loved to see the progress of what would happen to houses without human intervention in a flash animation, I don't like some other points.
I mean, from what I saw and read on the web page (especially in "Did you know?" section), the book simply says that all humans suddenly disappear, leaving their power stations still on. I seems to me like the author wanted to put forward something "cool" and "legacy-like" in this, so he talked about how all nuclear reactors will meltdown and explode because first the primary source of energy of cooling and then the emergency diesel generators will seize to provide power. I find this ridiculous, because the control rods would simply stop all the fission reactions in a power plant and so no cooling would be necessary... Author's words promote people's fear of Nuclear Power, which is so useful in todays World of climate change (go 42°C summers!)...
Also - is it just me, or all Americans are so patriotic that they thing Statue of Liberty will survive everything and always put in on a picture of Ice Age or any other similar scenario, where it's the only thing that survived...
And a last thing - if the plutonium from Nuclear Bombs would really be released because the coating rusts away, isn't there a certain chance of critical mass accumulating? We had natural fission reactors before, so why not something like this? Then the planet wouldn't really be green after we leave, because we would take all those funky looking creatures with us...