I wanted to put several client’s sites in a “standby” mode while updating the look, as well as a few little issues it had been having. I found a couple great plugins to do this with. I chose WP Maintenance Mode because it has a bunch of included “down for maintenance” pages designed, that get shown to anyone visiting the site while its active. Ultimate Maintenance Mode is another great option, with out all the theme options, etc. We use the paid version of it for all our “coming soon” and “maintenance mode” landing pages: Seedprod Coming Soon Pro.