'Pi' by Arnofsky is a great movie. Just got the chance to see it once though
Great flick. A friend in high school loaned me his VHS copy - took me longer than expected to return the film.
As for 'What the Bleep Do We Know?' I've seen the film, and it reminded me of 'The Secret'. Both films provide misleading scientific claims to support a bunch of pseudo-philosophical/spiritual claims.
These sorts of films can be fun to watch. I enjoy them. But I caution viewers to check up on the claims being made, especially the science. It's easy to mislead lay people, like myself, when the topic is theoretical physics, and the writers of these films take full advantage.
As for the New-Age like spirituality/philosophy behind them - be honest with yourself. The concepts being sold - and they are being sold - are marketing ploys. The concepts are presented because the merchants expect people to eat them up, not because the concepts are intellectually sound or have any real instructive value, but because people like hearing reassuring messages.
These films sum up consumer-driven science and spirituality.