1. higher resolution earth map
2. ability to stop the scrolling clock
3. ability to change the clock.. maybe digital
4. option to override the iphone auto lock timeout. Maybe some people just want it sitting on a desk looking pretty!
5. maybe an ability to place a visible marker on top of the map. Similar to a google pin drop. So maybe my parents are in Rome, my sister is in Sydney, and I would like to visually see when both of them are sharing some daylight so I can call or do a conference call. Visual markers on the map will quickly draw my eye to locations I'm interested in. And I don't have to exit out and look at some world clock.
6. if possible, add a + and - button at the bottom that will allow you to advance the display forwards or backwards up to a few hours or so. Then, trying into suggestion #5, I can determine what the status of a day will be like in a few hours.