LogMeIn for OmniOutliner on iPhone
 

I use LogMeIn for doing remote desktop chores like fixing my Mom's computer, etc, but just realized they have a pretty sweet iPhone app. While not perfect, this is definitely a decent way to use OmniOutliner on your iPhone until Omni comes out with their app. I think some people might have mentioned VNC but that is usually limited to wifi, but LogMeIn should work as long as you have a data connection anywhere.