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!

Brajesh Singh

This is a plugin for wpmu/wpmu+byddypress powered websites, where network administrators can limit the number of blogs a user can signup. 
It is pretty simple and adds an option to NetworkAdmin->Dashboard->network settings page, where you can limit the number of blogs. No additional frills required.
What It does
It adds an option to the Network settings page when you are logged in as site admin of the wpmu site(or wpmu+buddyppress site),Look at the bottom of options page,and You will see a text box like this asking for number of blogs allowed per user.If you set it to zero(which is the default),It will not restrict the blog registration then. 
For any support or any questions,please leave a comment at my blog
<a href="http://buddydev.com/buddypress/limit-blogs-per-user-plugin-for-wpmu/" rel="nofollow ugc">http://buddydev.com/buddypress/limit-blogs-per-user-plugin-for-wpmu/</a> 
And yeh did I mention <a href="http://blog.strategy11.com/" rel="nofollow ugc">Steph</a> has been very kind in reporting bugs and suggesting fixes.Many Thanks to Steph.

Limit Blogs Per User

This plugin is for WordPress Multisite and/or WordPress Multisite+buddypress based social network.It limits the number of blogs a user can create.

AP Gravatars vs Limit Blogs Per User