Voicethread offers wonderful opportunities for students to share, collaborate, write, practice speaking and learn. Colette Cassinelli has created a wonderful wiki packed with examples from each grade level as well as resources for how to get started. I was delighted to see Voicethreads from Kindergarten including student artwork. Directions are provided for a variety of different methods. Watch these. Try one yourself and, if you like, you can upload your example to this wonderful wiki.