Apple released iTunes 8.1 yesterday/today. I downloaded and upgraded it as soon as I became aware of the fact. So far it seems to be more stable than the previous version. Apple Insider writes this;

As anticipated, Apple on Wednesday evening delivered iTunes 8.1 with performance enhancements, support for CD imports to iTunes Plus, and new Genius features. Separately, the company also updated its Front Row media application.
iTunes 8.1 (65.4 MB) "is now faster and more responsive," Apple says. "You will enjoy noticeable improvements when working with large libraries, browsing the iTunes Store, preparing to sync with iPod or iPhone, and optimizing photos for syncing."
In addition, iTunes 8.1 provides several other improvements and bug fixes, including:

• Supports syncing with iPod shuffle (3rd generation).
• Allows friends to request songs for iTunes DJ.
• Adds Genius sidebar for your Movies and TV Shows.
• Improves performance when downloading iTunes Plus songs.
• Provides AutoFill for manually managed iPods.
• Allows CDs to be imported at the same sound quality as iTunes Plus.
• Includes many accessibility improvements.
• Allows iTunes U and the iTunes Store to be disabled separately using Parental Controls.

 

iTunes 8.1 also includes a couple of security enhancements.

 

So far so good. Will come back with an update later as to if it solves some of my previous problems with iTunes on Win 7 Beta.