There are several Widget Plugins that community members have developed for WordPress MU - here’s a rundown on some of the nicer ones:
BlogRush Widget for WordPress MU
Developer: Elad Salomons
The plugin gets extracted into the mu-plugins directory on your web server. Each time the widget is shown, the blogger earns one credit point and for each credit point earned, one of the bloggers posts is shown on some other blog. One can also earn points by referring bloggers to the program (like a pyramid scam but no money is exchanged). Don’t know what BlogRush is? Watch this instructional video to learn all about it.
WidgetBox Widget for WordPress MU
Developer:Incsub and Ring of Blogs
allows your users to use up to 9 Widgetbox widgets in their sidebars… just drop it into mu-plugins and watch as your blogs start to become populated with Tetris, PacMan, radio stations and glittertext, and more!
Add A Blog Recent Posts Widget for WordPress MU
Developer: skcsknathan001
Adds a sidebar widget to let you display Recent Posts from a single blog within your WordPress MU network of user blogs. Directly access the database [by its ID] instead of RSS.
List All Widget for WordPress MU
Developer: skcsknathan001
Adds sidebar widgets to let you display new/ updated/ active blogs from WordPressMU.
Got more? Do share!
