VoxForge
dano suggested the use of the Ekiga SIP client for collecting/contributing speech. Would need to set up Asterisk VoIP server on the VoxForge repository hosted server, using ports greater than 1024 (so we would not need root access to the server).
The VoxForge IVR application might serve as a start to this application, but something similar to Voice2Type's approach might work too.
See this post for additional information.
Ken