Bitkilo: The transaction information stays forever, but the additional info is temporary and doesn't stay in time capsule for the ages to come .

Using such 'special' bitcoin addresses is useful if you like to leave Short SMS to the world to:
1. Leave a message to the next generations (1DearSon...).
2. Greet a friend for anniversary or ... something (1Congratulations...)
3. Say something important and "memorable" (1DearWorldToday...)
4. Remember forever what happened today (1TodayWeFound...)
5. Leave a hint to yourself to be able to remember ... something
6. Declare your intentions in stone (1WontSmokeAnymore...)
7. Be creative. Share ideas with others