An idea (that might already exist): SMS reminders to take prescriptions. I know, for example, that my great-aunt struggles with this at 79: she's not debilitated or anything, but she's old and doesn't have the greatest memory, and remembering that she has one prescription to take twice every six hours, one to take every four hours, and one every 12 hours makes for a difficult life. (Hell, that's hard for me to remember.)