STFU && RTFM

The new taskbar in Windows 7 does its job admirably. Even so, many users complain that they can’t find the QuickLaunch bar. This option is not available by default in Windows 7, but if you want it, it is simple enough to recreate:
 

1. Right-click the taskbar, and choose Toobars -> New Toolbar
2. In the folder line type (or copy-paste) %userprofile%\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch
3. Click the Select Folder button

I had a user call in, complaining that her “Show Desktop” icon had disappeared from the Quick Launch bar. She was unable to find it again, and was really distressed as she used it a lot.
 
As it turns out, Show Desktop is not a regular program, but rather an OS command, known as an SCF-file, which according to FileInfo.com is a

Command used by Windows Explorer; for example, to move up or down a directory or show the Desktop; run via Internet Explorer.

 
The solution was simple enough, even though I would recommend that you implement it yourself rather than have a non-technical user implement it. Solving the problem goes as follows:
 

1. Open notepad
2. Enter the following in notepad:
   [Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop

Save the file as “Show Desktop.scf” in the folder C:\Documents and Settings\username\Application Data\ Microsoft\Internet Explorer\Quick Launch