I've been waiting for this for years (shoulda taken out a patent!): A headset that you can use for listening to your tunes, and just leave it on to use your phone hands-free! The Jabra C120s plugs directly into your mobile phone, and includes an adapter to also connect a stereo mini jack (like the one you would use for your iPod).

The headset has an in-line mic and a clothing clip. The C120s headset has EarGels, removable fitted attachments to secure a good in-ear fit, which Jabra said offers better stereo sound. The C120s is an "in ear" design, and they also offer a behind-the-ear model: the C220s.

The C120s retails for $29.95, the C220s is $34.95.
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(from MacCentral)