If your commute, or inability to get out of bed when the alarm goes off makes you chronically late and leaves you in a daily text-messaging frenzy, you might want to consider the Oops I'm Late! Professional for Smartphones. For $99.99 you can get the calendar integrated late notification that sends out notices based on your current GPS location. It's the geekiest alert system I can imagine, but will save you plenty of time and hassle.
The best part is you can set a single contact to your assistant, office manager or significant other, which can easily call on any phone number or mobile it's been assigned to contact. You won't have to look up contact information, event or location information.