Voki

Create a voki:
Free for non-commercial use, without creating an account

http://www.voki.com/site/create

Podcasts

Podomatic - Create a podcast:

http://www.podomatic.com/directory

Learn how to podcast:

http://podcastanswerman.com/learn-how-to-podcast/

Spreaker- Create your podcast:

http://www.spreaker.com/

Create MP3-Files

Audacity:

http://audacity.sourceforge.net/

VoiceThreads

Create a VoiceThread:

http://voicethread.com/