Front row showing items not in iTunes library

Check the Front Row playlist in iTunes, if they are there delete them.

 

Any progress on this?

This problem occurs because Front Row is not as smart as iTunes when it comes to identifying missing resources. Somewhere in the depths of your iTunes Library data file the references to the audiobooks still exist. The only way to get rid of them if you cannot 'see' them in iTunes is to rebuild your iTunes library using the following document as a guide:
http://docs.info.apple.com/article.html?artnum=93313

This will result in the loss of your music meta-data such as number of times played but it will remove the erroneous entries as during the rebuilding process iTunes will skip entries in the iTunes Music Library.xml file that are missing their resource reference.

Hope this helps.