We may be two formats removed from the cassette era with CDs and now MP3s, but some of those treasured cassettes are just too good to throw out (Journey, anyone?). Rick Broida of Lifehacker has a nice, simple write-up about how to digitize those cassettes. Why would anyone want to digitize a cassette? Well, cassettes have a lot of sentimental value (re: mix tapes from significant others) and if the tapes are in reasonable condition they will sound fine—no need to re-purchase music you already own.
Alpha Geek: How to digitize cassette tapes [Lifehacker]