If you had xxx amount of domains all on one server and wanted to have them all to use the same Wordpress theme and use pretty much all the same info in the database (like settings and plugins) except the content how would you approach that?

Will only be a single page of content on each one like this
swallowtailinn.com
but each site would have different content

Would Wordpress mu be what I would want to look for this? Or would there be a better approach.

To be honest been half tempted to change a wordpress template to a single html page and upload that to each site and then upload content to each one so then its just a single html page with no back end.