Water Efficient Fixtures & Appliances

I have information to share and also am wondering what related information others might have.

I am working with WaterSmart Software, a company which provides water utilities with solutions to help engage consumers in water conservation. WaterSmart surveyed California water users and asked them which fixtures or appliances they would be willing to replace, if it were free to do so.
Here's a partial list of responses:
- Replace Lawn with Native Plants: 37%
- Install Low Flow Showerhead: 47%
- Upgrade to High-Efficiency Toilet: 56%
Further information is available on the WaterSmart website, at http://www.watersmartsoftware.com/index.php?option=com_content&view=article&catid=2&id=36
Does anyone have links to similar studies?

Thanks,

Ora C
United States