Since upgrading to Leopard some folks have been having trouble with the popular open-source video player VLC from VideoLAN. Fortunately, the project has just released 0.8.6d substantially improving Leopard compatibility. The changes include video output improvements as well as support for the Apple Remote and various bug fixes. If you're running VLC under Leopard you'll want to upgrade.
VLC is a free download from VideoLAN. It's available in both Universal and Intel only builds.
[via Accelerate Your Mac]