There is a "Links" toolbar in Windows Explorer. It will allow you to create shortcuts to navigate to your most used files and folders quickly.
Using the keyboard to navigate folders and files will save you time. It's much faster then visually searching for a folder and using your mouse.
Utilizing the "Document Links Toolbar" in Windows XP can make saving documents in specific folders quicker and easier. This video applies to Windows XP only.
Using the Search feature included with Windows 7 can help you find folders, files, documents and e-mails quickly.
How you view your folders and files in Windows 7 can be altered and set to a default view. This can help you navigate your folders and files quickly.