Hound lets you remind other people to do things
You schedule a reminder to someone in your contacts list and they will receive an SMS reminder at the appointed time.
Stop reminding yourself to remind other people
With the hound app you can create a reminder now that will send to your recipient later. Instead of reminding yourself, you can schedule the reminder for someone else and it will send at the appointed time. You can immediately feel relieved of the responsibility of remembering to remind them later -- the app does it for you.