Yesterday we covered an issue where iTunes would unexpectedly quit when attempting to retrieve album/song info from the Gracenote CD database for certain CDs. A post from Apple's Discussions forums staff confirmed the problem and noted that it has supposedly been fixed:
"We were aware of an issue with CDDB lookup causing iTunes to unexpectedly quit. This was a server based issue. This issue should now be resolved. We apologize for any inconvenience this may have caused."