The Foundry has just released a new version of their digital painting system Mari, version 1.1, that adds a few new features like Ambient Occlusion rendering and support for FBX camera imports. The biggest feature however, is the support for Windows 7.
You can hit their website right now and download a free trial, or upgrade your registered version. Full release notes are also online for download and includes new features, a lengthy list of bug fixes, and a few issues to be aware of if you use the newest Quadro features.
