I'm looking for solution to a particular problem. I have source audio material on cassette tape. Assuming I have a machine with audio inputs, what sort of software (preferably free, or cheap) should I be looking for to:

rip the audio in realtime from the sound card to disk,

cut the file (it's lecture-style) into manageable portions, and

convert the files from (I assume) AIFF to MP3.

Solutions can be Mac or PC, as I don't yet know where I'm going to be doing this. If you have ideas or pointers, please post them, and if there are any particularly good ones I'll point to them here.