iTunes 9.1.1 was released via Software Update and provides a number of bug fixes, including:
Several stability issues with VoiceOver
A usability issue with VoiceOver and Genius Mixes
Issues with converting songs to 128 kbps AAC while syncing
Other issues that improve stability and performance
I installed it, but noticed nothing different because I don't VoiceOver. It's also worth noting that iTunes 9.1.1 doesn't have any security content according to the Apple Security updates knowledgebase article.
I typically wait as long as possible before installing software updates, unless they're security related. Do you install these types of updates, day and date of release, or do you wait a few days before installing incremental updates like this?
If you've had experience with iTunes 9.1.1 let us know in the TalkBack.