I know how you feel 89SE.... I'd be utterly lost w/o my PDA & my receiptionist.
I forget about things all the time... but I rarely forget about appointments (esp cars ones).
Last Thursday I forgot about a car appointment I had at the body shop (was going to go get those missing parts checked out, and my bumper properly aligned).
Well I've booked it again for this Thursday 8am... and I'm going to get an undercoating and an MVI while I'm there (she'* due in 2 weeks).
Now the appointment is more critical.... hopefully between myself and my PDA I'll remember. (My receiptionist doesn't start until 9am)