WP3.5 multisite "mu-plugin" to toggle adminstration menus for the entire network of sites.
Enable or disable WP3 Multisite Backend Menus. Adds options to toggle administration menus at Network Admin->Settings page under "Menu Settings". WP3 already toggles the Plugins menu, I've added a bunch more in the same/similar way.
I use the plugin to simplify the menus available to the entire network of sites. I use this plugin in a WP3.5 Multisite installation to disable the Deltete Blog, Permalinks, Import, Add Users and Themes menus.
The plugin also removes some of the admin bar menu items as well.