Tired of Manilla Explorer Folders? Get Rainbow Folders!
In Windows, it's another story. Using Rainbow Folders to change the default icons gives you a quick way to visually distinguish your folders. Color all your image folders orange, documents green, or memos from your boss brown. It's a very simple way to add a bit of sanity to any directory that is overrun with subfolders. You can even add tooltip text to your folder, which displays in Explorer's status bar when you single click it.
As an added bonus you can also switch between old school (Windows 9x), XP, and Vista style icons. Sweet.
(note: publisher's site is not linked as it timed out repeatedly)