Do’s and Don’ts: iPhone app UI design

Do’s:

Use these colors in the UI: blacks, greys, greens and blues consistent with the iPhone SDK
Create fluid, invisible controls
Use standard input fields with a different color selection
Implement familiar gestures

Don’t:

Be inconsistent within the app
Over-style controls
Create a confusing navigation in the app
Make users relearn how to use the iPhone through your app
Get in the user’s way