http://www.ftb.ca.gov/individuals/New_Home_Credit.shtml
See the link above from the CA Franchise Tax Board that all $100 million budgeted for new home purchasers have been used.
However, the Sacramento Bee (see http://www.sacbee.com/topstories/story/2168638.html) reported on September 9, 2009 that a plan to extend the state tax credit to another 4,285 buyers of new, unoccupied homes in California is in the making.