I got some ideas about the OH as well.
1. The cover with additional storage (say 8-16 GB) for media content, especially HD videos, with a kickstand ala N900 and N86 for watching those videos comfortably.
2. The in-vehicle phone holder with powerful GPS receiver and FM transmitter (it just stays there and you clip the phone into it).
But the important thing in all the ocean of ideas we got, the OH MUST NOT bear the usual price tag of crApple products.