Ext.ux.grid.ProgressColumn is a grid plugin that shows a progress bar for a number between 0 and 100 to indicate some sort of progress. The plugin supports all the normal cell/column operations including sorting, editing, dragging, and hiding. It also supports special progression coloring or standard Ext.ProgressBar coloring for the bar.
This is based off the work started here: http://extjs.com/forum/showthread.php?t=36291
You can extract the attached zip file into the examples folder to see a demo.
This has been tested working in FF2 and IE6
Edited: tweaked the css a little bit to so the dirty indicator displays correctly
Edit 2: Fixed the IE6 problem with an ugly little hack, but it works