Have a look at this movie:
I found it on the Dan's Data website, in a very interesting article about possible extension of human consciousness into computers, or duplication thereof... Some very interesting reading, it's highly recommended, especially the couple of "footnotes" at the bottom (which, as Dan says, contain more text than the article proper).
I particularly liked this bit, in a quote near the end:
"...waking consciousness is dreaming - but dreaming constrained by external reality"
It engenders some intriguing thoughts... I think I might have to buy that book to have a read sometime!