Since I own my own business I had to put some work-arounds in place right away. I have a large marker board I use specifically for business tasks.

Post-it notes have become my best friend. If I have to go 5 places I have a post-it note for each and when I am done with each one I toss it. In the car my post-it notes are by the speedometer (the only place I look on a regular basis).

I have all appointments in Google Calendar AND an appointment book which I try to carry almost everywhere with me.

The downfall is not entering info IMMEDIATELY and thus forgetting until it's too late.

Oh, and I have the alarm on my cell phone but it doesn't work well as I tend to hit the off button and never think twice about what it was set for!