I remember when I started working in law firms (well before law school) and was introduced to the variety of color coding of client files. Some firms I have worked at had yellow folders for correspondence, red folders for pleadings, etc. These sorts of filing tricks are quite individual and you may have some of your own. Now you can start to translate them – if they involve color – onto your Windows PC!
Lifehacker recently highlighted a utility called Folderico 4 that will colorize Windows’ yellow folder icon to the color you’d prefer. Use a single color to identify client folders and a different one for non-billable folders, or use colors for particular sub folders to make it even faster to file your electronic documents in the right place.