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.
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.