Shows your server space (free and used) as a funky Pie Chart in your backend. It also shows a percentage bar in your WordPress dahsboard.
Driven by Richard's suggestion, I've used Alex Rabe's WP Memory Usage Plugin as template and several WordPress tutorials on how to build plugins. Within a few hours, the basis was established. Then I integrated Rasmus Peter's Pie Chart Script and made it all work together. Code Cleanup followed: renaming functions, hooks, variables, deleting code that's not needed.