I've been meaning to get around to basically plagiarizing this UI for a personal linux system monitoring tool.

I've tried a bunch of the popular linux disk/resource usage monitors but I find none are as flexible/nice to look at as Windows' Task Manager overview graphs and Resource Monitor. Any time I'm using a Windows system I will dedicate a monitor to just having Resource Monitor's disk usage tab open (although it can result in nontrivial CPU usage under certain disk access patterns).