Microsoft® Silverlight is a cross-browser, cross-platform plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web. Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications.

Silverlight supports fast, cost-effective delivery of high-quality video to all major browsers running on the Mac OS or Windows.

Changelog:
# Fixes problems that were caused by Silverlight and McAfee scanning tools interactions
# UI automation stability fixes, including:
* graceful failures when attempting to use features that require .Net Framework 3.0 or 3.5 on machines that do not have either framework installed
* improved Tablet support
# Fixes an issue that arises when Mac users customize their environment by removing Arial and Verdana fonts
# Fixes a known issue with Isolated Storage IncreaseQuotaTo method