Ron Rennick

The WP/WPMU author link from the <code>the_author_posts_link()</code> template tag on the blog will link to the author’s buddypress member profile instead of the author’s posts page.
This plugin will only affect blogs where buddypress is activated sitewide. It will function the same in either the mu-plugins folder or in the plugins folder and activated sitewide.

BP Blog Author Link

This plugin changes the blog author links on a buddypress site to link to the author's buddypress member profile.

isikom

Category Text add a widget that allow to add arbitrary text or HTML code, different for each category of your blog. 
It’s very usefull for SEO, because you can make different text for different category, so also different banner etc. 
Now you can select also the home page position.
The plugin born from idea of <a href="http://www.rossozingone.it" title="web agency" rel="nofollow ugc">Vanny Rosso</a> for his blog <a href="http://www.fantagiochi.it" title="on line games" rel="nofollow ugc">Fantagiochi</a>

Category Text

category text allows you easily to add a widget for a Category Text-Box.

BP Blog Author Link vs Category Text