CALIopolis

Using WebHuddle, you have options—and flexibility. Meetings can be conducted either in conjunction with an enterprise’s existing teleconferencing service, or utilizing WebHuddle’s optional voice over IP. WebHuddle also offers recording capabilities—presentations can easily be recorded for playback over any web browser for those who missed the live meeting.

WebHuddle -- Alternative Communication

There is an intriguing bit here that seems to indicate that you can stream PowerPoint with audio.

The terrific Center for Computer-Assisted Legal Education has been featuring lectures and other educational materials at CALI Radio, otherwise known as the ClassCaster, for several months now.

A natural extension for podcasting. Between Lawyers: technology + culture + law

And they got it mostly right. It is important to note that Classcaster is the platform that CALI Radio runs on.