Samuel Mello

This plugin was designed to create virtual micro-sites that employ different themes while using the same content from one source. It uses WordPress’s rewrite rules to decide which theme to display to the end user based off of the url they visit. This will allow you to access the same website in a virtual sub-directory with a completely different theme displayed.
REQUIRES PRETTY LINKS TO BE TURNED ON

Cameleon

Virtual Microsite Creator & Multi-Theme Enabler for WordPress

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.

Cameleon vs Advanced Automatic Updates