You can Audioboo it for reporting, storytelling, education, as an online dictaphone, or just to let friends know what you're up to. Audioboo works on ios, android and nokia devices or via the web, and soon blackberry and windows 8.
Voki is a free service that allows you to create personalized speaking avatars and use them on your blog, profile, and in email messages. Similarly Photoface will use your face, animate it and add audio. (There's a voki at the top of this page.) Classroom accounts are available with special avatars and features.