Quicktime

Below a "truly silent" method, taken from http://www.mediamacros.com/item/item-1006687115/:

How do I make Quicktime Install Silently?

First you need the stand alone installer from Quicktime. Then place a text file beside the installer and name it QuickTimeInstaller.ini and place this text inside....

[QTSETUP]
license_option=0
no_dialogs=true
registration_dialog=false
supress_speed_dialog=true
install_qtjava=false
install_qd3d=true
show_sample=false
show_readme=false
show_programfolder=false
install_qtinfo=true

Then I use these settings:

<packages>
<package id="quicktime" name="QuickTime" revision="3" priority="10" reboot="false">
<check type="uninstall" condition="exists" path="QuickTime"/>
<install cmd="%SOFTWARE%\Quicktime\QuickTimeInstaller.exe /quiet"/>
<install cmd="cmd /c del /s /q "C:\Documents and Settings\All Users\Desktop\QuickTime Player.lnk""/>
<remove cmd="C:\WINDOWS\system32\msiexec.exe /i {5E863175-E85D-44A6-8968-82507D34AE7F} /qf /quiet"/>
<upgrade cmd="%SOFTWARE%\Quicktime\QuickTimeInstaller.exe /quiet"/>
<upgrade cmd="cmd /c del /s /q "C:\Documents and Settings\All Users\Desktop\QuickTime Player.lnk""/>
</package>
</packages>