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There are a couple of similar programs for the Mac, but they don't seem to have the level of VCR-esque programming sophistication.... The idea of having pre-programmed radio shows is really cool.

Try:

Bitcartel RAW -- http://www.bitcartel.com/raw/

Audio Hijack Pro -- http://www.rogueamoeba.com/audiohijackpro/

I use the former. The latter seems to be a lot more sophisticated but I found doing the basics on it a lot less transparent. RAW is very easy to set up and run, and FWIW it is able to record several streams of audio simultaneously in the background on a G4.

RAW has some kind of iCal-based programmability, but since I have an iBook it isn't on unless I'm around anyway.
 
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