I hate it when my album artwork isn't perfectly square and has white bars along the top or bottom in iTunes. Or sometimes the artwork file itself has white borders. It would be great if iTunes could allow for cropping of cover art images just like Address Book can crop images for Address Book pictures.
I just sent this exact text to Apple iTunes Feedback and if you agree with me please do the same. It is clear that Apple only listens to the most popular feature requests. Thanks.