I am writing a UI for configuring a big system.
The typical workflow for a person using the product is to open a configuration form, which can contain hundreds of fields, make some small changes and then close it.
Because there are so many fields, I think that it will be useful for users to be able to see which fields they edited before saving their changes.
What visual cue would you use to indicate to the user that he has changed the value of a given field.
Follow-up question: Besides editing fields, users can add new sections from my UI. Ideally the cue for "edited field" could also be used to indicate which sections have been added with the current edit operation.