Image resolution for iOS targeted devices

Hi,

I am building a platform game for both iPad and the iPhone family. Should I design all graphics for the iPad - 1024 x 768 pixels, and scale down to ?? for iPhones? And then use the @x2 function for the iPad images? Or what is the best approach here?

Joakim [import]uid: 81188 topic_id: 20210 reply_id: 320210[/import]

easier way to use 480x320 for 3g devices and 960x680 for 4g and ipad
on ipad however there will be black bars because of this [import]uid: 16142 topic_id: 20210 reply_id: 78920[/import]

My favorite option is this :

480x320 for 3gs
1024x768 for iPhone 4 and above and iPad [import]uid: 84637 topic_id: 20210 reply_id: 78941[/import]