I have a buddy who does not know squat about computers. He uses a Mac. (I personally don't think those two comments are mutually exclusive)
Anyway, opinions aside, he converted DAT/PCM/Cassettes/CD's or something into about 300GB or 400GB of AIFF files. He said it took 4 days to mirror the drive and I told him to FLAC the files. How can he easily convert AIFF to WAV? Remember, this guy needs someone to hold his hand so it has to be really, really simple.