Audacity is one of the better sound editors around. With a low floor and high ceiling you can do everything from create podcasts to mix and edit music.
UPDATE: Jill Baedke has produced a GREAT video tutorial series along with supporting resources. Her videos are so complete and well supported that they will help anyone go from total Audacity novice to expert in no time! Try them out yourself, or pass them along to a friend.
Labels: Audio and Video