They're more like guidelines...

Finally! An equivalent to SciTE's edge.* settings in Visual Studio! Trouble is, it's not called "edge" or "margin" (Eclipse), but "guidelines". No wonder I couldn't find anything on the topic when I was searching online!

Thanks go out to Sara Ford who blogged about this wonderful feature. If only I had known about this, oh, three years ago! :)

Here you go. Just copy/paste the following into a .reg file and import it. You can change the colour (currently a very pale green) and at which column you want it to show (currently at 80). You can even add more columns apparently, but that's getting a little silly.

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\Text Editor]
"Guides"="RGB(192,220,192) 80"