These days, seeing people listen to audio cassettes is like watching a car from the 1930s on the highway, and I must confess my collection is lying nicely ordered in its place, without being touched for years. Even this way, sometimes I turn to it, grab some music, and play it in my old Panasonic walkman. It would be much easier to play the MP3 or the audio CD, but that would surely kill the feeling.
The feeling I mentioned earlier could not be brought back by any digital device, but you can get some cool iPod cases to help you remember, because I think the audio cassette should never be forgotten. These being said, let me introduce you the most awesome iPod case I have seen lately - Contexture Design's unique cassette cases!
Unfortunately, we're talking about unique cases, and for now there are only a few left, as you can see here. Being able to hold first- and second-generation iPod nano models, these cool iPod cases are priced at C$45 (≈US$38), with C$4 shipping.
Simply awesome! Just one final thought - I think this is something you could also manufacture by yourself with a little patience and the right tools, if you miss buying one from Contexture. Even more, you'll surely get out much cheaper, and have a lot of fun in the process!