This paper describes a study which aim is to evaluate the effectiveness of podcasting technology in teaching online courses. A sample group of 104 students, with an optional access to audio recordings (podcasts) of the course, completed an online questionnaire. Some ANOVA tests were done to compare the group of students who listened to the online recordings (33) with those who did not (71). The results of the study indicate that the students who listened to podcasts demonstrated more effective learning, greater satisfaction, more participation activities, greater autonomy and better motivation than those who did not.