Platform(s): Android (prototype)
If you're chronically late, you need Bounce, the Android app that tells you when to get going. The app works with Microsoft Exchange or Google Calendar to check appointments, then consults your GPS, and other factors like traffic, to determine how long the commute will take. This is ideal for procrastinators but job hunters should try it, too. An iPhone version is in the works, but if you're impatient, check out Go Time, which basically does the same thing.