vrypan

FFDirect will submit your posts to your friendfeed.com account the moment they are published. Some reasons to prefer FFDirect instead of using your feed:
<ul>
<li>Images included in your posts will also be submited and visible in the corresponding friendfeed entry.</li>
<li>The same applies to any link to audio (.mp3, .wav, .aac) files.</li>
<li>Your posts will appear in friendfeed the moment you publish them.</li>
<li>Google Analytics-friendly URL tagging.</li>
<li>Pulls number of friendfeed “likes” and comments under your posts.</li>
</ul>

FFDirect

FFDirect will submit your posts to your friendfeed.com account the moment they are published.

dalziel

This plugin will take the comments & ‘likes’ on your posts from FriendFeed and place them on the post that they’re related to. The comments come with the person’s name, a link to their FriendFeed profile & their FriendFeed image. 
Your blog’s readers can also comment on & like your posts directly from a form displayed under the FriendFeed comments (this is an option that can be turned off)

FriendFeed Comments

Puts the comments and likes from FriendFeed on your posts.

FFDirect vs FriendFeed Comments