Clyp makes the process of audio recording podcasts as simple as possible.
Micropodcasting in 30 second bursts with Croak.it.
Tough to explain all the capabilities of the online recording and podcasting tool that is Evoca in just 3 minutes. However for language teachers (and others?) and with the capability to record from a phone, Skype or a computer, this is well worth looking at in more detail.
Audioboo allows you to capture conversations, discussions, observations and publish it to the web with the miminum of fuss.
And an introductory tutorial: