Joshua Parker

This plugin brings back the missing dashboard blog feature that you may remember from the WPMU days. Also, it adds the user role as set on the settings page. The only difference is that it is missing the “create dashboard” feature. So, you must first create the dashboard blog, and then add the blogname on the network settings page.

WPMS Dashboard Blog

Redirects users without a blog to the /wp-admin page of a "dashboard" blog.

Tom Lynch

Switch Theme allows WordPress Network Administrators to switch all the themes on their WordPress installation to a different theme in only a few clicks.
This is particularly useful if you have large network of blogs which you wish to switch to a new version of your theme.
If you find this plugin useful please <a href="http://supportus.cancerresearchuk.org/donate/" rel="nofollow ugc">donate to Cancer Research UK</a>, and let me know what think you via <a href="http://tomlynch.co.uk" rel="nofollow ugc">my website</a>.
Switch Theme is only for use with WordPress installations with multisite enabled, it will not work on standalone installations or WordPress MU.

Switch Theme

Switch Theme allows WordPress Network Administrators to automatically switch all the themes on their WordPress installation to a different theme.

WPMS Dashboard Blog vs Switch Theme