I haven't been following cosmology very closely in a while; could someone update my knowledge a bit?

* The only evidence for dark matter is that galaxies and galactic clusters are moving faster than they should be; i.e. they are acting like there is more gravitational mass around.

* The only evidence for dark energy is that the redshift of distant objects is higher than it should be; i.e. they seem to be accelerating away rather than decelerating.

* All of the other properties of dark matter and dark energy are negative: we have not been able to observe anything, so we know what it's not.