I found interesting feature of Visual Studio editor. You can enable it to display vertical lines (guides):
Unfortunatelly to enable the lines you must change registry:
1. Find registry key: HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\Text Editor
2. Add string value there: "Guides"="RGB(220,220,220) 4, 8, 12"
Here is a link to the original blog i found it on: Guidelines – a hidden feature for the Visual Studio Editor