As you may (or may not be aware) the iPhone 4 will have what Apple is calling, the Retina Display.
This is a high resolution display with more pixels than your eye can physically see. Tweetings for iPhone as it is now will still work and look pretty much the same as it is now.
Upgrade to Tweetings 3.1 (when it’s submitted and approved) and you’ll immediately see some amazing, sharp, images.
Here is just a little teaser at full size