Out with the old and in with the new! YOUTUBE has everything you need, for any subject. You as a teacher can stand and blab about god knows what all day long, and your visual learners will not get anything out of it. You need to keep your students engaged, and there's no better way to do that than a sweet video.
TeacherTube is an excellent website for all ages and educational areas. As a big history and geography nut, I took a good look at what this website provided for those areas. The video: http://teachertube.com/viewVideo.php?title=World_Population_Explosion&video_id=189453, I would use this video in a world population unit (gr.7), to give my students a better understanding of where the population is distributed throughout the world. They should also understand what areas are overpopulated now and what areas have always been overpopulated.
Another one would be: http://teachertube.com/viewVideo.php?video_id=47658 "If the World was a Village of 100 people." What percentage of each of those 100 people would be from each of the continents? (61 Asia) (14 Africa) (11 Europe) (9 South America) (5 North America) (0 Austrailia)...if you wanted to know... Then you could try it with your class, split the students into the continents. It really is a cool site, because a lot of students have made their own educational videos and put them on there and some very creative.
I would definitely encourage students to do their own videos, especially with the technology available nowadays, students can be quite creative once they get an idea in there head.