I just read about a great idea for giving students feedback on oral presentations in the free newsletter from Faculty Focus. Lora Helvie-Mason, Ed.D. evenly divides her students in the four corners of the room. In these small groups, students then take turns doing their presentations for their small audience. The audience members offer feedback. She does this activity one week before the final presentations are due. As with peer reviews of writing, you can determine the criteria for students to use in their evaluations.
For more details, read Helvie-Mason’s article about this technique.