Notes

The positioning of the cursor rulers is scaled according to the font size. The larger the font size the greater the chance that gaps will get introduced into "thick" cursor ruler styles like the column highlighting style. The size of the gaps are also dependent upon the font size.
Using the column-like highlighting style while using a variable-width font looks strange. Should this be considered a bug?
After you save changes to your user settings or your CursorRuler settings the changes take effect once the cursor state changes.
In ST3 build 3012 and older the add_on_change() method was not implemented and therefore CursorRuler will not use it. In ST2 and also ST3 build 3013 and later it is available and CursorRuler will use it.

Known Minor Issues

In ST3 the standard shortcut key for the Wrap Paragraph at Ruler menu item (⌥⌘Q on OS X, Alt+Q on Linux and Windows) is rebound to instead use the CursorRuler: Wrap Lines command for doing proper line wrapping. However, using the Wrap Paragraph at Ruler menu item without the shortcut key still uses the normal wrapping command. It seems there isn't a way to override ST's default menu items in that sort of way. For details look here.
In ST2 it doesn't work on previewed files. Perhaps this is beneficial as an indicator for when you're looking at previewed files?
While moving a selected group of text with the mouse, the insertion-point cursor is not shown with its own dynamic ruler. Though, this is probably preferable since this distinguishes the editing cursors from the insertion-point cursors.
In versions of CursorRuler older than 1.1.6, if CursorRuler is added to the ignored_packages list in the user preferences then upon saving the preferences any open files that have cursor rulers on them will retain those rulers as permanent static rulers. The only way to remove those static rulers would be to either no longer ignore the plugin or reopen the files that are affected.

Cross - I found out about this Sublime Text plugin on February 20, 2013. It predates CursorRuler by about a month.

rulerz - This Atom plugin does cursor rulers.

License: MIT