What's up with that! Restarted, told iTunes where to find my library; loaded music library, but songs will not play. The play button switches to a pause button, but timers do not change and no sound!?
OSS 3D appears to need an update to work with iTunes 7. Yes, uninstall it but back up your OSS 3D preferences if you made custom EQ settings. I forget where they are. Home folder-Library-OSS settings or something ... just Spotlight OSS and move the folder to somewhere safe like the Desktop.
OSS 3D should have an uninstaller in your Apps. folder.
I'm not familiar with GimmesomeTune but OSS seemed to cause conflict with iTunes for me so try removing that first.