Oh man, what a long story. I love(d) “Quick launch” in Windows XP. But Microsoft decides to change behavior of “Quick launch” in Windows 7. Now you pin/unpin application to Taskbar.
I don’t like how things on Taskbar now changing their size and position.
But – OK, we will learn to live with this way of Taskbar. Behavior of Taskbar is Microsoft’s decision and they know what they are doing (well … we can talk about that).

BUT – soon after installation you will notice that some applications can’t be pinned to Taskbar. Here are two types of issues and solutions:
1. One of problems can be caused when files with “not allowed” names are used. Windows has a few reserved names that include things like “Documentation”, “Help”, “Setup” … and this files can’t be pinned.
Solution:
You can find (change!) the list of “not allowed” names in register key:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionExplorerFileAssociationAddRemoveNames

2. You also can’t pin applications from network drive to Taskbar. Many users will have problems with this strange behavior…
Solution:
Copy application EXE to your local drive, pin application to Taskbar from local drive. Yes, now it can be pinned 🙂
Then use right-click on pinned icon in Taskbar to open a menu. Choose application icon and right-click again. Change “Target” and “Start-in” fields to your network location … and voila.

I hope this will help someone…