Microsoft has just released the latest Silverlight Beta 2 tools for Visual Studio 2008 and the accompanying SDK today.
Here's the overview (from the site):
This package is an add-on to provide tooling for Microsoft Silverlight 2 Beta 2. It can be installed either on top of Visual Studio 2008 RTM or Visual Studio 2008 Service Pack Beta, and it provides a Silverlight project system for developing Silverlight applications using C# or Visual Basic.
This download will install the following:
- Silverlight 2 Beta 2
- Silverlight 2 SDK Beta 2
- KB950630 for Visual Studio 2008 RTM or KB950632 for Visual Studio 2008 SP1 Beta
- Silverlight Tools Beta 2 for Visual Studio 2008
Silverlight Tools Beta 2 for Visual Studio 2008 includes: - Visual Basic and C# Project templates
- Intellisense and code generators for XAML
- Debugging of Silverlight applications
- Web reference support
- WCF Templates
- Team Build and command line build support
- Integration with Expression Blend
- Enhanced Setup with upgrade support

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Here are the download locations:
~Robert Shelton