Stuff like this helps. I have looked at this for my lists app (http://itunes.com/apps/fastlists http://itunes.com/apps/fastlists - mostly for checklists and re

Stuff like this helps. I have looked at this for my lists app (http://itunes.com/apps/fastlists http://itunes.com/apps/fastlists - mostly for checklists and repeated use lists rather than todo lists) and may look again but there are still scenarios where you have to do one of the following: 1) throw user data away. 2) ask the user a question about how to resolve the conflict 3) save both copies and leave the user to figure out which one they actually want. As a developer I'm not yet comfortable with any of these approaches for casual user scenarios although option 2 or 3 is probably right in many more serious/professional set ups. I've gone with email as my transfer mechanism which also allows sending to other users and to be used as a backup although I do keep looking at sync systems and solutions. I found this a good write up of the potential complications even for a simple list app like mine. http://blog.helftone.com/clear-in-the-icloud&#x2F http://blog.helftone.com/clear-in-the-icloud/