Suzy, very interesting.
The dark flow concept has been lurking around for a few years.
See
http://en.wikipedia.org/wiki/Dark_flow
I find it entirely feasible that matter should accrue variably about the universe; witness the formation of filaments of galaxies and huge bodies such as the Great Sloan Wall of galaxies. Perhaps there is an extraordinarily high-mass body of galaxies beyond our view causing us to flow in that direction even though the universe as a whole is slowing its expansion. In which the description "dark flow is merely movement" becomes self-explanatory.
Thanks for posting, Rob