I keep a paper list of the appointments in my desk, and THEN (this is the helpful part), I have a dry erase calendar on the wall with ALL family appointments (medical, car maintenance, play dates, etc) that I update once a month. It's a BIG calendar, so I have room to write, and I see it every time I go into the kitchen (it's on the wall by the stove--not too close, I don't want spatters on it!!) Anyhow, this helps us, because EVERYONE can see the appointments and not schedule over things (or double book their mother). We stand at the calendar when on the phone, so we don't plan playdates or other fun things when appointments may be.

I have a friend who also does this, only she is more motivated than I, and each member of the family has a different color marker, so she only has to write the appointment and knows who it is for based on color. I just write their names and do it all in black. Whatever works!