I'm probably in the upper range in terms of regular-folk-paranoia, but even after shredding my documents, I usually mix it in with food and regular garbage so that the information is destroyed. I also don't just shred important documents, I shred everything so that it's even harder to discern what is important and what isn't.

The irony, of course, is that despite my paranoia, my identity has been stolen because of a screw up with the credit agencies and I've been dealing with all 3 credit agencies for months trying to resolve this.