If you use a Boolean field with radio buttons in Drupal 7, the false radio button outputs before the true. This became an annoyance to us whilst working on mega-sized forms, so here's our fix. To fix this you'll need to create a custom module, and implement the hook hook_field_widget_form_alter().
The following code assumes your module is called 'example'. All the code does is reverse the order of the options whilst preserving the keys, simple!