As I am looking at using WPMU for an upcoming project, I have been looking through some of the plugins available for WPMU specifically.
One of the plugins I found useful was Total Upload Space Remaining by Dr. Mike, but I found it wasn’t compatible with the Upload Space plugin, so I addresse that to make the two play happily together.
Also, it wasn’t really visually right for me, and was reliant on images, which I felt was unnecessary for what it was doing (a basic bar graph).
My new version features a CSS-styled graph based on simple DIVs. It is also quite configurable.
It is available for download from the WPMU Project page:
Total Upload Space Remaining v2.0