How can I use    within a redactor/rich-text field? We need to be able to add super and sub-text to a rich text field without having the client dive into the markup. Has anyone successfully added this as a redactor or Craft plugin?
There are keyboard shortcuts that can accomplish super and subscript.

From the Redactor changelog:


Superscript shortcut now crtl+h (high, super) instead of old ctrl+l
Subscript shortcut now crtl+l (low, sub) instead of old ctrl+h