Timing the launch with this week's Macworld Expo in San Francisco, Etymotic has released two new cellular headsets, the hf2 and the etyBLU. The hf2 is based on the company's ER-4P audiophile earbuds (pictured), but is intended specifically for iPhones; this means the inclusion of a microphone, as well as an end/send switch which doubles as a track
