I think the humble cassette is a fantastic format, you can fast forward/rewind it with a pencil, it's cheap, it can produce some great effects (warping, ghostly sounds bleeding through from previous recordings, etc), and has the added thrill of not knowing whether it's going to get chewed up.
Here's a link to Bear-man sticks maestro Phil Jenkins' solo side-project Bullied into Boxing, for some minimalist, synth-greatness.
