In earlier blog posts, I've noted you can use your camera phone to create digital reminders:
1. Where you parked your car in a parking lot (or on a street)
2. Your hotel room number
3. Name badge when someone doesn't have a business card
Recently read another use: to keep track of what you eat, if dieting. It's easy to forget if you don't record it; and photos can help you keep track. If you start to build up numerous pictures, you'll at least have digital reminders - to count it all. Even if you wish you didn't.