Is it possible to share reminders?
Actually, you can share a reminders list, as long as the person you want to share with has their own iCloud account. You can share one of your reminders lists either from iCloud.com or from the Reminders app in Mountain Lion.

Either way, the process is the same: Hover over the name of a list for a second, and a small icon will appear. Click on it, then type in the name or e-mail address of the person you want to share the list with.