Automatically adding post and pages to new blog setups

You can use the export feature to export the posts. Go to Tools>Export and choose WordPress. You will be prompted to add a plug-in at when you import it into the other sites. Just click install plug-in at the screen that pops up. You can then upload the XML file that you generated by exporting the original posts. At import you will have the option to import users or switch them to an existing user, and whether or not to download attachments.