The gadget world is full of "why didn't I think of that?" discoveries - and some "why is anyone thinking of that?" finds as well. From November, Marubeni Infotech would like to sell you the CMFC-001 "Fragrance Case for Earphone". It's a little round aluminum button that you pop open, fill with fragrance-scented cotton, and snap onto the "Y" portion of your earphones. Whereupon it acts as an earphone accessory that emits pretty smells. Harmless enough, true, but still... Anyway, designed by CEMENT Design, it comes in white, pink, or black and costs JPY2980.
More info (Japanese):
http://www.monodo.jp/comonodo/product/f_e/