The Windows taskbar is probably on of the most frequently used Windows features, so optimizing it to your needs could boost your windows experience.
Personally, one thing that annoys me is that i accidentally click wrong icons and startup applications that i don’t want to start while using the taskbar.
After some googling i found that if an executable has no icon, you can pin it to the taskbar and use it to create space between icon (groups).
So, i created a small .net application with no icon that quits directly after start.
You can download the taskbar divider application here, if you want to have more than one divider, copy the executable and pin the copie(s) to the taskbar.