Head on over to the AIUSA Troy Davis page Finality over Fairness or go directly to the action: Support Clemency for Troy Davis. You can also keep up with the latest developments on the Troy Anthony Davis website.
And while I'm at it, some recent 'must reads' for Californians:
'Dysfunctional' death penalty racks up 28-year, $5-million tab (LA Times)
Can Californians afford to keep the death penalty? (Sacramento Bee)
California Still the Highest Spender on the Death Penalty (ACLU)
Divided appeals court upholds death sentence (San Francisco Chronicle)