I went to the Contra Costa Countywide GIS meeting yesterday and found out about these countywide files that were recently posted to the Casil FTP site in the coco-county folder. Infrared imagery is expected to be posted by January 2009. The LiDAR was flown for flood control analysis, but it is publicly available for any other research. The county GIS deptartment asks that you contact them to share how you work with the data. Also, I came across this LiDAR resources site with links to other data and helpful info.