I wasn't able to find any threads talking about this really annoying issue but have seen a few people mention it in blog comments. Basically I love my new iPhone 4 display and as the new app updates come out it seems there's a bug in the OS where the high resolution icon is not used. You can see the high res one WHILE the update is downloading and installing but as soon as it finishes many (not all) app icons simply revert back to the low res version ( which looks terrible on the new display ). AIM did this today. Others have been eBay, Amazon, Paypal, ifitness, lastfm, Pandora, etc. What is the deal with this? Some apps seem to be able to make the icon update, others refuse to use the high res that is obviously available (I can see it!!!). Is there a fix?