Silverlight 2 Release Candidiate is a developer-only release.

The official information can be found here. One the page, we can download the RC0 SDK and Tools for VS2008 SP1. It does not work with Expression Blend 2.5 Preview any more. Instead, it works with Expression Blend 2.0 + sp1 preview.

The RC0 offline document can be downloaded here.

The Silverlight Unit Testing framework has been updated for RC0 and can be downloaded here. Detail information can be found here. As for today, the Visual Studio 2008 Silverlight Unit Testing Project Template has not been updated, it works fine if you follow the option 1 path in this Jeff Wilcox's post.

There isn't a RC0 version of Deep Zoom Composer. Instead, we just need an updated project template.

Some projects are already porting to RC0, for example:

Siverlight multi-file uploader.

ExpandoHeaderControl.

There is an interesting form layout tool called XAML Power Toys and it supports RC0. 

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