Where can we find information about PCI DSS compliance that is focused on those of us who are “Mom & Pop” shops?

Since most small organizations fall into the sell-assessment category, a great resource is the Security Standards Council SAQ (Self-Assessment Questionnaire) section. Specifically these documents:

SAQ main page

PCI DSS SAQ instructions and guidelines

SAQ: How it all fits together

SAQ A-D and Guidelines

For remaining 30 PCI DSS questions & answered: Solutions to tough PCI problems