Could it not be possible that the illusion of cosmic acceleration is caused by the lensing effects of an overwhelming gravitational pressure, permeating space and related to the CMBR? The answer, if you didn't already guess is "yes".
I've assembled a work outlining the theory, providing some thought experiments as well as observational evidence (solution to existing scientific anomalies) and mathematics in support of this concept at http://lcgp.wordpress.com/
This is a work in progress. Comments would be most appreciated. READ IT FIRST THOUGH!!!
“If one part in one million, million, million, were off during the inflationary period of the universe, it would have either expanded into oblivion, or have collapsed under it’s own weight” – Stephen Hawking