iamgarrett

Google’s Blogger tool has a great blogroll gadget, which I’ve always wanted in WordPress. I tried a few plugins that advertised similar behavior but was never quite satisfied – so I made my own.
This will grab all your links with a category of ‘sidebar’ and show them in a list on your sidebar. Specify each link’s RSS/Atom feed address and it will grab the latest post, a link, and reorder the list based on when these posts were written. It only requires that you have jQuery and PHP and uses the Links and Widget section already included in WordPress.

Good Reads

An ordered blogroll widget for your sidebar that displays your favorite blogs, what they're writing, and when.

Boone Gorges

Mariusooms

reblevins

Requires BuddyPress 1.7+ and PHP 5.3+.
The BuddyPress Groupblog plugin extends the group functionality by enabling each group to have a single blog associated with it. Group members are automatically added to the blog and will have blog roles as set by the groupblog admin settings.
Features:
<ul>
<li>P2 integration and frontend posting.</li>
<li>Admin can set Template specific groupblogs.</li>
<li>Allow group admins choose the desired template page themselves.</li>
<li>Full blog theme integration. The included bp-groupblog theme mimics the group pages.</li>
<li>Automated blog registration at group creation stage.</li>
<li>Bypass default blog validation to allow dashes, underscores, numeral only and minimum character count.</li>
<li>Blog privacy settings are initially inherited from group privacy settings.</li>
<li>Group members are automatically added to the blog.</li>
<li>Blog roles match group roles as set by the group admin.</li>
<li>Solid error checking that the blog follows validation.</li>
<li>Group admin tab to access the group-blog settings.</li>
<li>Blog themes will have the ability to pull in group info and create a theme that could resemble the group exactly.</li>
<li>Leaving the group will downgrade the member role to ‘subscriber’.</li>
<li>Allow the group admin to select one of his/her existing blogs.</li>
<li>A new ajax backend.</li>
</ul>

BuddyPress Groupblog

BuddyPress Groupblog extends the group functionality by enabling the group to have a single blog associated with it.

Good Reads vs BuddyPress Groupblog