The current flash-in-the-pan doing the rounds on Grazia and The Guardian is Make A Mixa. The website offers a customisable cassette which acts as a USB case. Purchasers can then upload music onto the USB creating a 21st century retro mix tape.
My heart still goes out to Retropod who were closed down by Sony for steampunking a Walkman into an ipod carrier. We say: bombastic, say me fantastic. Sony said: Infringement of copyright laws.