I have used blogger and voki before in my class and at a summer tech camp. All of my students this year have blogspots and avatars as well. I love this technology and made a goal this year to have my students post their digital creations on their blogspots. I have had some success in doing this, but we often run out of time to post all of their work. We have also run into glitches when it comes to posting documents from Google Docs, but that is another story for another day.