iTunes 10.0.1 has the bugfixes listed below as well as adding the Ping Siderbar rolleyes
iTunes 10.0.1 provides a number of important bug fixes, including:
• Addresses an issue where the picture quality of a video changes depending on whether the on-screen controls are visible.
• Resolves an issue where iTunes may unexpectedly quit while interacting with album artwork viewed in a separate window.
• Fixes a problem that affects the performance of some third-party visualisers.
• Addresses an issue where the iTunes library and playlists appear empty.
• Resolves an issue that created an incompatibility with some third-party shared libraries.