The Apple iPhone supports the following audio formats:
AAC (16 to 320 Kbps)
AAC Protected (MP4 from iTunes Store)
MP3 (16 to 320 Kbps)
Audible (formats 2-4)
Unfortunately, Ogg Vorbis didn't make the list.
Almost.Â There will be new headphones which are similar to those of current iPods [1/29/07], but which incorporate a microphone. Calls can be answered and ended by squeezing the microphone. Wireless earpieces that use Bluetooth technology to communicate with the iPhone will be sold separately.
UPDATE: Yes, as of the release of iPhone OS 3.0, the iPhone now supports A2DP.