Richard Vencu

This plugin creates and maintains one or multiple hierarchies of blogs in the WPMS network. Options screens appear in network admin dashboard. The blogs hierarchy can be used for several purposes such as:
<ol>
<li>consolidate posts (or latest posts) from descendant blogs only</li>
<li>display a list of descendant blogs or even a tree of blogs from any node</li>
</ol>
Other features
<ol>
<li>Hierarchy cannot loop (cannot set as parent one of the descendants or itself)</li>
<li>The main site (blog_id 1) cannot have a parent</li>
<li>Individual blogs may be taken out of hierarchy</li>
<li>Multiple independent hierarchies may be created 
Limitations: this plugin is not optimized for large installations. More than 50 blogs can be hard to manage.</li>
</ol>

Network Sites Hierarchy

This plugin creates and maintains one or multiple hierarchies of blogs in the WPMS network.

Dave Bergschneider

Intuitive Category Checklist makes selecting categories easier for sites with a large amount of categories and sub-categorization. This plugin works in both quick edit mode and stand full post mode.
Related Links: <a href="http://www.crunchingpixels.com/portfolio/2011/07/intuitive-category-checklist/" title="Intuitive Category Checklist Plugin for WordPress at Truimage Productions" rel="nofollow ugc">Plugin Homepage</a>.
This release has been tested compatible with all WordPress versions since 3.1
Please submit feedback to the plugin’s home page in regards to features you would like to see in the future.
<h3>License</h3>
Good news, this plugin is free for everyone! Since it’s released under the GPL, you can use it free of charge on your personal or commercial blog. If you have found this plugin to be useful plese give it a rating or you can thank me and leave a <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=39WPEFFWFDXTL" title="Donate with PayPal" rel="nofollow ugc">small donation</a> for the time I’ve spent writing and supporting this plugin.

Intuitive Category Checklist

Adds expanding/collapsing functionality to the categories checklist inside posts.

Network Sites Hierarchy vs Intuitive Category Checklist