mosheeshel

This plugin extends Theme Switcher and Theme Switcher Reloaded, this plugin detects the existing active plugin and uses it to display a floating list of available themes, to enable creating a Theme demo site.
Basically it enables anyone to create a demo site of all his available themes, just create a site with all the demo pages you can think of. The download and Enable either Theme Switcher or Theme Switcher Reloaded plugins, and this plugin, and when you access any page on the site a floating div will appear on the top left side of the site, showing a dropdown menu wutg the current theme selected. When you choose a different theme from the list, the site will switch to have that theme as the selected site theme.
Note: that this plugin is dependant on either the Theme Switcher or the Theme Switcher Reloaded plugins, and what it does would not be possible without the work done on those plugins.

Floating Theme List

This plugin extends Theme Switcher (/Reloaded), it displays a floating list of available themes, enabling EASY creation of a theme demo site.

Gary Pendergast

Advanced Automatic Updates adds extra options to WordPress’ built-in Automatic Updates feature. On top of security updates, it also supports installing major releases, plugins, themes, or even regular SVN checkouts!
If you’re working on a WordPress Multisite install, it will properly restrict the options page to your Network Admin.
While this will be useful for the vast majority of sites, please exercise caution, particularly if you have any custom themes or plugins running on your site.

Advanced Automatic Updates

Nice Plugin

Adds extra options to WordPress' built-in Automatic Updates feature.

Floating Theme List vs Advanced Automatic Updates