I just heard from the proprietor of the House of Restless Spirits, who informs me that the Halloween yard haunt is definitely returning for 2010, with "some cool new illusions...as well as upgrades to many existing effects."
House of Restless Spirits is consistently one of the best yard haunts in Los Angeles, so mark your calendars; even though the dates have not been scheduled yet, it usually runs on October 30 and 31, in Santa Monica.
UPDATE: Hours are 7-11pm on Saturday and Sunday. Location is 1008 Euclid Street Santa Monica, CA.
Picture at Top: An angry black cat hisses outside a window at the House of Restless Spirits.