Microsoft has released Windows Phone SDK Update for 7.8 with two new emulator images for 256 MB and 512 MB Windows Phone devices.
Android 4.0 runs both on tablets and phones, having new features for UI, communication, sharing, media, connectivity, input types and enterprise.
Google has released a YouTube SDK for .NET for those interested in programmatically accessing YouTube from a .NET or ASP.NET application. The YouTube API is built on top of Google's GData protocol, extending it with specific data classes contained in the Google.GData.YouTube namespace.
Amazon has released the AWS SDK for .NET, a set of libraries, code samples and documentation for .NET developers creating applications that use Amazon’s cloud.
The DotNetServicesRuby team, a partnership between Microsoft and Thoughtworks, announced the launch of Milestone 1 - Technology Preview of Ruby SDK for Microsoft .NET Services, a key component in Azure, the Microsoft Cloud Computing Platform.