Damn cool iPhone trick. I had to keep tapping my iPhone screen again and again while being docked, so that screen is lit and doesnt go to sleep. This is because while using Twitterrific, I prefer the screen to be on all the time. And now, I am going to follow this trick to keep my iPhone on all the time when docked.
The screen will not lock automatically if the iPhone is docked and music is playing. Simply start playing music and then dock the iPhone and open the app you want to use. The iPhone won’t sleep until the playlist, album, or podcast is finished. If you don’t want to listen to anything, you can always turn down the volume.
Note: I had bought an iPhone dock from Apple store since iPhone 3G doesnt get shipped with a dock
[via - Macosxhints]