Over on the (unofficial) SevenForums site, one user has come up with a way to insert spaces into your Windows 7 taskbar so you can create separated icon groups. The trick involves creating some blank shortcuts that lead to a fake program and pinning those shortcuts to the taskbar.
To facilitate the process, he provided a zip file containing multiple “blank shortcuts” and blank.exe files. (Don’t worry – we scanned them with Microsoft Security Essentials – they’re safe. Other forum users tested them too).
After extracting the files, you’ll have a folder called “Blank” and a ReadMe.txt. Before pinning the Shortcuts to the taskbar, you have to move the entire “Blank” folder to C:\Windows. Then grab a shortcut and drag it to the taskbar. Now, instead of seeing a blank (white) icon, you’ll just see a space! The zip file contains four different “blank” shortcuts and you can only use one of each.
What a great trick!