Do you mean for all sites  that are created from a specific site  definition? If so, you could create a stapling feature that staples the publishing  infrastructure to that particular site definition.

blogs.msdn.com/.../feature-stapling-in-wss-v3.aspx

Personally, I would be more inclined to set up a custom site definition that includes the publishing infrature as part of that definition.

www.intranetjournal.com/.../pij_08_04_08a.html