Ogrork the Mighty said:All these different actions is one of the things WotC needs to clean up in the next edition. It's too complicated for new players. Move action, full round action, standard action, free action, swift action, immediate action. It's far more complicated than it needs to be.
Actually I think that swift and immediate actions help to clarify the rules.
You no longer end up with a lot of things being "a free action that can be done outside of yuor turn", like Feather Fall used to be. Feather Fall is now an immediate action. Which is a swift action that can be done outside of your turn, but takes up your next swift action.
By calling them swift and immediate actions you also limit the number of actions that can be done with them. 1 swift action per turn and an immediate action uses up your next swift action. There is potentially an infinite amoutn of "free" actions per turn, only limited by the DM's interpretation of what is "reasonable" or not.