This tip requires both users to be on iOS 5 or greater, and syncing their accounts through iCloud.com.
Apple has allowed the ability to share your Reminders lists used the Reminders app on your iPhone or iPad in iOS 5+, via iCloud. I'm sure future functionality will allow this in the App, but for now you have to use iCloud.
Note: Before starting this tip, you must ensure you are syncing your Reminders using iCloud on your iDevice. Check it in your Settings.
Here's the process:
- Go into the Reminders app, and create a list to hold your shared Reminders (for example, some Reminders you would like to share with your spouse, kids or secretary). Optionally, this can be done on iCloud.com.
- Log into iCloud.com with the same account you are using to sync your Reminders.
- Click on the calendar.
- Identify the Reminders list you would like to share to the left of the calendar, and click the icon on its right (the network icon).
- Type in an iTunes account name (that is also using iCloud) you would like to share your Reminders list with.
- Optional: you can select View and Edit, or just View for the sharing option.
- The other user will have to accept the shared Reminders list before the accounts will be linked to share the information.
[crarko adds: I haven't tested this one.]

