I think this article is mainly relevant to mobile web. If you've got myspace on your mobile phone why type in comments and messages when you can send a quick voice message instead? I know livejournal already offeres a similar feature with a voice posting phone number. Users can add a text transcript later when they're at a keyboard.

Theres also companies such as spinvox who offer the ability to do voice messaging and voice to blog. With spinvox you record your voice message and it converts it to text. This way you can post/message using the easiest mobile medium (voice) and others can either read or lsiten to it depending on what is easiest.