#492
You may have used some file/folder marking applications like iColorFolder and Folder Colorizer, which achieve the classification by changing color of file/folder, or flag which one is important. Another similar software to be introduced to everybody, Shedko Badges, yet it is very unusual!

#150
In normal conditions, we can only create shortcut in a folder, and send to the desktop at best, although Windows 7 supports "Pin to Taskbar" or "Pin to Start Menu", but this is only effective for applications, not for folders. So, is there any more powerful tool to achieve this? Folder2MyPC can add any shortcuts of folders, applications to the "My Computer" or "Control Panel", easy to use and free.