copperblade

Update: If you need more functionality please see the next generation of this plugin at https://wordpress.org/extend/plugins/network-latest-posts/
Creates a widget to show a list of the most recent posts across a WordPress MU installation. It shows the most recent post from each blog. This plugin is based on the work of many authors.
This works on previous versions of WPMU, but not on previous versions of WordPress (where it doesn’t make sense).
<h3>Options</h3>
<ul>
<li>Number of posts to show – list this many posts.</li>
<li>Number of days to limit – only go back this number of days to get posts. Set to -1 for no limit (default).</li>
</ul>

Multisite Recent Posts Widget

Creates a widget to show a list of the most recent posts across a WordPress MU installation.  It shows the most recent post from each blog.

Patrick Chia

This plugin allows you to generate a <code>gravatar favicon</code> for your blog and admin logo included Apple touch icon. Just activate the plugin, and it will add gravatars to your blog template and admin panel automatically, no setting and nothing. But you must enable your avatar(Discussion Settings). (W6A4N4-L26P6-WSH)

Gravatar Favicon

This plugin allows you to generate a gravatar favicon for your blog and admin logo included Apple touch icon.

Multisite Recent Posts Widget vs Gravatar Favicon