As someone who is very new to theming the biggest problem I've had is determining which .png relates to a certain graphic on my iPhone4. I just recently came across the /UIImages extracted .png's which is fantastic for the really easy items like Black_DataTypeUMTS.png (3G symbol) etc. but only somewhat helps for things like TopShine.png (Area between status bar and search bar in safari). So for all the expert themers out there (and I know there are a lot, I've seen so many beautiful custom themes here) how do you know what all the UIImages .png's are? Is there a list somewhere? I've started to make one in excel with file names, a description, and image sizes but I imagine someone has already beat me to the punch.