A Cure for the iTunes 4.8 Error 400 Blues
Apple has posted a new document on the 400 error that some iTunes 4.8 users have been experiencing when trying to access the iTunes Music Store. They not only acknowledge the error, but provide a nice solution. It would appear that there are a few unneeded or corrupt cookies in iTunes that are causing the error. Follow the instructions for removing them and you'll be right as rain.
[via MacInTouch]