Call Pheeder and leave a message, seconds later all your friends or contacts will instantly receive a text message alerting them that you’ve left a new voice message on your pheed and they can call in to retrieve that message whenever they want. Then they can reply to your message, or forward the message on to their own pheed.
They can also check on the web as Pheeder is a social network, all people have a user space, and you can look up pheeds by tag.
It reminds me of Sponit or Loopnote, but using voice blogging instead of normal text blogging (and the fact that you don’t have to be on the web to post), actually it is probably most similar to Evoca (an audio social network where you can phone in your audio snippets). I suppose Twitter and Jaiku are similar, but posts from all users are not organised by tag. Like these services each user can see who is following them, and who they follow.