no, the Kasimir effect is an evidence for quantum fluctuations and the zero point energy of vacuum. It is not yet clear if dark energy and the zero point energy are the same thing.
See
http://arxiv.org/abs/astro-ph/0406504.yes and no
Same as mr Krauss himself says in the movie , should the zero point energy of vacuum and the dark energy be the same stuff then the dark energy should tear the universe apart
In other words the dark energy is not so strong as the theoratical calculus assume
Having said that, it is evident that all begins from the Heisenberg's principle which lead to a non intuitive and astonishing result
Vacuum does not exist
The first experimental evidence has been the kasimirìs effect
The acceleration of the universe and the Heisenberg's principle are therefore related stuff even though some parameters must be still tuned
