During my Sitecore 7 training the trainer, Raul Jimenez, pointed out the ‘Reset Blank’ checkbox on the Template Fields template.
Before today I’ve never used it, so I had no clue what it was that the checkbox does. I figured this might be the case for a lot of others as well:
If the ‘reset blank’ checkbox is ticked, when that field is saved without a value the field will actually be reset to the default value. This is very handy in situations where it doesn’t make sense to have the field blank.