Is there any place I can find ideas on adding iPhone 4 gyro support to a Unity iPhone game right now?
nice guy made a plug in!
No. Unity Technologies will release a new version of Unity iPhone with support for iOS 4. Until that point, you can't use the new iOS 4 features in Unity as far as I know.
If you have Unity iPhone Advanced I'm sure you could write a native plugin that you could use to query what the gyro is spitting out. You would either have a native function you query on the game side for values, or you could use `UnitySendMessage` to send values to the game. The former is probably more performant, though.
It's not that simple, and the current version of Unity iPhone has problems linking in debug mode.