I decided to use gravatars in the themes and plugins of my WPMU site, http://missionsplace.com rather than using buddypress or something like that because of the added benefits of avatars showing up on other blogs across the internet. To encourage my users and bloggers to setup their own gravatars, I created this plugin that shows a preview of their current gravatar, and instructions and links on how to set up or modify it on gravatar.com on the profile admin page. Hopefully this will push more users to create a gravatar.
Get it here»
A very simple plugin to change the footer text on every admin screen from “Thank you for creating with WordPressMU” to “Thank you for using YOUR_SITE_NAME/LINK.” It is very simple to customize the text to your liking.
Get it here»
Both were created by Aaron Edwards of MissionsPlace.com.
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December 2, 2008 
That’s ace, thanks for sharing :)
Thanks dude
I triyed this plugin in my site, but was a little bit hard to customize my text. My question is, google could banned me To add links there?
This is an interesting plugin. Thanks.
Great stuff. Good sharing mate.
Gravatar has been making a big impact in the WordPress Community. It’s a good tool.
I’ve been using Gravatars on my blog. It does help to make the blog more vibrant.
Ive use it always. Very usefull.