I'm looking for a feature somewhat like the vertical red 80 columns marker in NetBeans but one that's easier to use. I'd like it to function more like the tabs in MS Word except that the horizontal line is displayed on the entire file. I looked on the Comparison of Text Editors over at Wikipedia and I didn't find that "vertical ruler" was one of their features.
It would be used to line up html tags in a massive file that I did not create, but have to maintain.
You can do column guides in Visual Studio: blog post here (registry entry required though).
Notepad++ has this feature.
At http://tech.groups.yahoo.com/group/vim/message/87027?l=1 is a way to get a similar behavior in vim.
The Zeus editor has the option to set two vertical column markers. The first is the line wrap column and the second is the left margin column and the settings for both of these markers are found in the document type.
These markers are drawn as a solid vertical line one pixel in width.