We are experimenting today with adding RAG (Red / Amber / Green) indicators in SharePoint Lists. It's a pretty clear way to draw someone's attention to the most important items. And the nice thing about this implementation is that the data is being submitted automatically from a form drawn in the Starfish CI app on an iPad.
Here's a snapshot of that iPad form, drawn with the ease of drag and drop - no programming required! If only the SharePoint configuration was so simple!