Try Voicethreads
Voicethread allows you to upload images; then different students can record their comments for each image, creating a slideshow with many commentaries. Students can also add written responses. Foreign language teachers, lower school teachers, and english teachers will particularly like this site, but history, science and math teachers can create interesting Voicethread slideshows. The site has tutorials and suggestions for using a voicethread in the classroom Try it.
Create a free edublog to get your own comment avatar (and more!)