superann

This plugin filters the sitewide comments feed as well as individual post comment feeds.
Upon first-time installation and activation, all trackbacks will be removed from the default WordPress comments feeds. 
You can override this behavior on the options page and also use the comments or trackbacks only feeds described below.
URL for comments only feeds: add the variable “comments” to your feed query string.
<ul>
<li>http://mysite.com/comments/feed/?comments</li>
<li>http://mysite.com/?feed=rss2&withcomments=1&comments</li>
</ul>
URL for trackbacks only feeds: add the variable “trackbacks” to your feed query string.
<ul>
<li>http://mysite.com/comments/feed/?trackbacks</li>
<li>http://mysite.com/?feed=rss2&withcomments=1&trackbacks</li>
</ul>

Separate Feed Comments and Trackbacks

Remove trackbacks from your sitewide and individual post comment feeds, and/or have alternate feeds for comments or trackbacks only.

vivekpuri

Get Support: support@linksalpha.com
Google Buzz enable your blog. Make it easy for your visitors to share your blog content on fastest growing social hub – Google Buzz.
BuzzRoll Plugin shows Google Buzz Button with Comment Count on each blog post. BuzzRoll also shows Google Buzz Comments on each blog post.
Choose from <code>6 Google Buzz buttons</code>. Want more options? Email to support@linksalpha.com
Features:
<ol>
<li>Show Google Buzz Button – <code>Next to Post Time</code> or <code>Comment Count</code> or <code>before Post Content</code> or <code>after Post Content</code></li>
<li>Show Google Buzz Comments – <code>after post content</code> or <code>after comment form</code></li>
<li><code>6 Google Buzz buttons</code> to choose from</li>
<li>Popup window for quick sharing on Google Buzz</li>
<li>Option to manually position Google Buzz Button and Google Buzz Comments. Check installation instructions.</li>
</ol>
How is this different from Buzz button by Google:
<ol>
<li>BuzzRoll offers 6 button styles, while Google offers only 1</li>
<li>BuzzRoll <code>also shows comments</code> from Google Buzz on your blog, while Google’s solution does not</li>
</ol>
Check out our other plugins that you will find extremely useful:
<ul>
<li>Social Discussions: show popularity of your blog posts on Social Networks including Twitter, Facebook, Google Buzz, Yahoo, and bit.ly. https://wordpress.org/extend/plugins/social-discussions/</li>
<li>Social Stats: track your blog activity on social networks – monthly/weekly/daily, and track your popular posts. https://wordpress.org/extend/plugins/social-stats/screenshots/</li>
<li>Network Publisher: auto publish your blog posts to Twitter, Facebook, LinkedIn, Yahoo, Yammer, Identi.ca, and MySpace. https://wordpress.org/extend/plugins/network-publisher/</li>
<li>Retweeters: shows Twitter users who recently tweeted links from your blog. https://wordpress.org/extend/plugins/retweeters/</li>
</ul>

Separate Feed Comments and Trackbacks vs Buzz Roll