The irony is, dashboards that provide quick answers are largely redundant any way. Quick answers are answers you already know and just want validated.
As suggested in the article, a sparkline is fairly easy to build. Should you like to experiment with bullet graphs, however, ExcelUser has a great tutorial. You may also want to download and try an add-in such as MicroCharts 1.0 which does sparklines, bullet graphs and more.
The only complaint I have about MicroCharts is that it interacts in some strange ways with other add-ins such as XLCubed – which I use daily. Other than that, it looks very nicely implemented.