Call Recorder from Ecamm Network is a Skype plugin that allows you to record your calls (interviews, podcasts, etc.) as two-track AAC files for that perfect 'edited for your blackmailing pleasure' effect (calls can also be converted to MP3 for the AAC-haters in the audience). A recent version update also brings the ability to save voicemails as quicktime movies.
Call Recorder is a Universal Binary and requires Mac OS X 10.3.9, as well as Skype for Mac v1.4 or higher. A demo is available, while a license costs $14.95. As of this writing, Ecamm Network is offering a sale price of $12.95.