Frierson v. Woodford, ___ F.3d ___ (9th Cir. Sept. 14, 2006) (prejudicial ineffective assistance of counsel found in failing to investigate and present important mitigation evidence at the penalty phase of a trial, failing to review juvenile court records, and failing to challenge a key mitigation witness's assertion of his privilege against self-incrimination at the penalty trial).
http://caselaw.lp.findlaw.com/data2/circs/9th/0499002p.pdf