Graphic display resolutions

http://en.wikipedia.org/wiki/Graphic_display_resolutions
http://developer.appcelerator.com/question/132822/different-resolution-annotation-images-in-android
Using density-specific resources on Android : https://wiki.appcelerator.org/display/guides/Using+density-specific+resources+on+Android
multiples screens on Android: http://developer.android.com/guide/practices/screens_support.html