Only two weeks after releasing iTunes 9, Apple has released an update with numerous bug fixes and improvements. One notable change is that the green zoom button brings up the mini-player, just like it did before iTunes 9 took that away.
Another issue resolved by iTunes 9.0.1 is the ordering of podcasts. Some users were complaining that these files were not sorted properly in version 9.
The latest iPhone firmware is live. Steve Jobs announced the release of iPhone OS 3.1 today at Apple's Rock and Roll media event. The latest iPhone firmware can be downloaded using iTunes.
The software adds new features and includes bug fixes. iPhone Dev-Team has recommended against updating your firmware until further notice if your iPhone is jailbroken and/or unlocked.