Here's a great article posted recently on AvWeb about one of the most annoying (and potential dangerous) habits that has developed recently at non-towered airports.http://www.avweb.com/news/columns/183931-1.html
You can find a lot of useful information about operations at non-towered airports in the AIM (http://www2.faa.gov/atpubs/AIM/index.htm)--specifically 4-1-9 (http://www2.faa.gov/atpubs/AIM/Chap4/aim0401.html#4-1-9) and at the AOPA Air Safety Foundation Web site, specifically (http://www.aopa.org/asf/safety_topics.html#airport and http://www.aopa.org/asf/publications/sa08.pdf).