Behind the Special Effects of Inception
Lanxon writes "Wired has a behind the scenes look at how Inception's reality-distorting special effects sequences were shot, in an interview with Chris Corbould — the man 'prized for his ability to stage a real-life tank chase in St. Petersburg (GoldenEye), to flip a working juggernaut down a narrow Chicago street (The Dark Knight), and to build a working Batmobile that can do 30-metre jumps without the aid of a single post-production pixel.'" Hopefully most of you who intend to see Inception have already seen it by now, so you don't have to worry about spoilers. It's getting pretty much universal praise.
I think the phrase you are looking for is that "not once have you ever seen a CGI-rendered scene that you could identify as CGI-rendered that did not look CGI-rendered."
The ones that didn't look utterly fake looked real enough for you to assume that they were real. That's kind of the whole point, you see.