I love the look and feel of the iPhone UI but there are some niggles. The phones main 'dashboard'/start screen wont scale. Every app is an icon on a grid. As soon as you have more applications than screen space there are going to be problems. It's interesting to see that apple also has a poor application launcher UI (fidner) on mac os x too. I wonder if someone will be foolish enough to create a quicksilver equivalent for the iphone?