http://www.voki.com/, voicethread.com http://voicethread.com/ and voxopop.com http://www.voxopop.com/ . They're all great sites for developing my students' oral skills. They have so many features that are so engaging and motivating. I haven't tried any of them with my students yet, but I can still tell that my students will love them. It's really hard to describe all the features, but I love voki.com. As matter of fact I already made my own voki avatar (check it out on the top right corner of my blog) . I felt like a little child while I was making it. I encourage all my classmates to create their own voki avatar and then post them in their blogs. I also encourage you to try this sites. When you create your voki, besides creating a graphic character you can then make you voki talk. You can make it talk by recording a message, uploading a sound file and typing. I love the fact that you can type your message and the voki just talks your message out. I introduced myself with my voki avatar and you can probably see that when my voki pronounces my name and my city is not very clear but it's just because they're in Spanish.
Sometimes we feel overwhelmed by sites we don't know how to use. What I do is try to find tutorial videos in youtube.com http://www.youtube.com. It's amazing how much you learn by watching people explaining how to use sites. I actually found a little kid who recorded a video giving instructions on how to post my voki avatar on my blog. The kid's video was extremely enlightening, I could finally post my voki avatar thanks to the video posted by this little kid. Internet has opened a learning environment where people just share and collaborate. It's really exciting to learn new tools every week.