October is National Cyber Security Awareness Month. The FTC has brought together some good beginner references for secure safe Internet use. There is a section for home users in addition to a good section on safe basic business information technology practices.
Even organizations who have an existing security plan may want to take a brief look at this site to see if they have missed anything.
Stay Safe Online : http://www.ftc.gov/infosecurity
The National Cyber Security Alliance (NCSA) has a related site with decent information and a self assesment test you can take to evaluate your security stance. http://www.staysafeonline.info/