Josh Maxwell

The <a href="http://ardentpixels.com/" rel="nofollow ugc">Ardent Pixels’</a> Gravatar plugin adds the gravatar photo associated with the user’s email to their profile page. If they do not have a gravatar account, it displays a link to create one. And is MultiSite compatable!
This plugin does not add gravatar support to your theme.
<h3>Notes</h3>
= Donations = 
Feel free to <a href="http://ardentpixels.com/josh/contact/" rel="nofollow ugc">donate</a> if you liked this plugin.

AP Gravatars

A simple plugin that adds the gravatar photo associated with the user's email to their profile page... MultiSite compatable!

Joshua Parker

This plugin brings back the missing dashboard blog feature that you may remember from the WPMU days. Also, it adds the user role as set on the settings page. The only difference is that it is missing the “create dashboard” feature. So, you must first create the dashboard blog, and then add the blogname on the network settings page.

WPMS Dashboard Blog

Redirects users without a blog to the /wp-admin page of a "dashboard" blog.

AP Gravatars vs WPMS Dashboard Blog