Now released in Japan are two new DS accessories. The first is the headset which works with Nintendo WiFi titles that support voice chat. Metroid Prime Hunters is the only game currently available that has this feature, but Pokemon Diamond / Pearl uses it too. Supposedly more games are in the works with the voice chat feature, although none have been announced. The headset retails for 1200 yen ($10).
Also out is a two pack of New Super Mario Bros. themed touch pens. They are larger styli with pictures of Luigi and Mario on them.