Pantheism: the belief that identifies God with the universe, or regards the universe as a manifestation of God.
Panentheism: the belief that God is greater than the universe and includes and interpenetrates it.
To kick off the question, here are some videos:
[Video: Neil deGrasse Tyson speaking at Beyond Belief '06]
[Video: Auto-tuned science song, "We Are All Connected", by John Boswell.]
[Video: Auto-tuned science song, "The Poetry of Reality (An Anthem for Science)", by John Boswell.]
To the pantheist, the universe and god are one. To the panentheist, god interpenetrates and abides through out all of the universe. Christianity, understood from one particular school of thought, could arguably be a form of panentheism (Colossians 1:17, "He is before all things, and in him all things hold together").
As you can see in the first video's speech from deGrasse Tyson, the truths of science can inspire a great awe and a passionate sense of wonder as profound as those in any religious prophet. In my experience, it is very common to hear cosmologists and other types of scientists, whether they are religious or not, speak in reverential terms about their love for knowledge and about the numinous experiences that they have while studying reality.
I think that it is entirely possible to have an "atheist spirituality" because, if the atheists are correct, the feelings that atheist scientists have while studying their field literally are no different to those claimed by the religious camp. And, if the atheists are wrong about the nature of a transcendent reality, then I still feel that the experiences that go through the minds of such scientifically enamoured folks are found within a particular orientation towards whatever divinity or transcendency we can touch from within our limited view on reality.
After all, as Francis Bacon believed, "God has, in fact, written two books, not just one. Of course, we are all familiar with the first book he wrote, namely Scripture. But he has written a second book called creation."
However, even given what I just said I do not feel that the scientific experience, however numinous, is in any way making any claims about religious matters (transcendent ones anyway, historical claims are another story). Because science only studies that which is immanent (i.e. our material universe), this is why I don't feel that the scientific worldview is ultimately a religious one.
So no, the scientific worldview isn't pantheism or panentheism, but I would forgive somebody for getting the two confused at a simple glance.