Here are the Six Flags era coasters and their destinations:
X-Flight: moved to Kings Island in 2007, name changed to Firehawk
Steel Venom (nee Superman): moving to Dorney Park for 2008, name changed to Voodoo
Dominator (nee Batman): moving to Kings Dominion for 2008, keeping name
Thunderhawk (nee Serial Thriller): moving to Michigan Adventure for 2008, keeping name
Beaverland Mine Ride (nee Roadrunner Express): was rumored to move to Cedar Point, now doubtful
Villain: to be auctioned
Big Dipper: fate uncertain, possibly to be auctioned
Raging Wolf Bobs: probably going to be scrapped
Double Loop: can't be easily moved, probably going to be scrapped
Head Spin (nee Mind Eraser): fate uncertain
Hope that helps.
Mike
R.I.P. Geauga Lake: 1888-2007.