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.

Emanuela Castorina

This plugin in a multisite installation shows the ID of the current site/blog in the admin bar menu. The ID of the current site/blog is linked to the site info page. 
It adds also a custom column with site id information inside the sites list table. 
It can be installed only on a multisite.

Wp Show Site ID

This plugin in a multisite installation shows the ID of the current site/blog.

BP Blog Author Link vs Wp Show Site ID