404s on custom sections and entries I have created a section called "Services" and an entry within called "seo".  When I click to view that entry in the admin area, it takes me to domain.com/services/seo, as expected, but that 404s.

Is there anything else required to use channels?

I have .htaccess in place working properly and the shipped sections ('News', and the home page) all load fine.
You'll need to create a template, and add the path to that template to the Entry Template field in your "Services" section's settings.

For instance, if you create a template called /craft/templates/services/_entry.html, you'd use the path services/_entry for your section's Entry Template field.

With this setup, you could also add an index.html file to the /craft/templates/services folder. That template would render when the user visits the URL domain.com/services, enabling you to create a listing/index view for your "Services" section.

For more info, I'd suggest looking at the excellent official docs on templating in Craft.