This was a recent post on the University of Canterbury website on Dark energy.
http://www.comsdev.canterbury.ac.nz/news/2008/080125c.shtmlBasically it says that the model we have for the universes expansion is based on the idea that the universe is the same density all the way through, and so the time space dialation we experience is too rapid. But because the universe is not isotropic but filled with bubbles, filaments and voids. So depending on where you are in this set up will dictate how old you see the universe as and how "fast" everything is moving away from you.
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