Hong Kong based OMIZ Industrial offers a 4-in-1 headset. The OMS600 headset features MP3 player, Bluetooth interface, FM Tuner and SD-Card slot. This MP3 Player headset features also an LCD screen.
The only product photo on their site features the The Aviator film with Leonardo Di Caprio. I guess they have a promotion going in Hong Kong with the movie. No information on the price and on availability.
See also the OMIZ site.
To combine bluetooth with the MP3 player function in the headset makes sense. This way the headset can also work as a handsfree for the mobile phone.
There are a couple auctions on eBay for this OMIZ bluetooth headset. (Thanks Myonaut)
The TDK MOJO MP3 Player Headset is now selling at a low $89.97 on Amazon.com.