Empire have been talking to Leo DiCap about Shutter Island, but he also said the following regarding Inception!
"It is complicated. It's a complicated story-structure, but it's sprung from the great filmmaker Christopher Nolan's mind, and he's been able to take highly complex jigsaw puzzles in a narrative and put them together like we've never seen."
"This is a plot-structure that's working on multiple layers simultaneously - and quite literally when I say simultaneously, I do mean multiple narratives simultaneously. So everyone's going to be in for a treat when they see it, including me."
Sounds great! Although if The Fast and The Furious is your kinda movie, then your brain will crash and burn with this methinks!