You can visit the VS Extensibility portal for the latest information and resources.  Follow the links to get the SDK (note there's now an easier way to download at the bottom of this mail).

Some really cool things in this release:

• Power toys (Check out the Source Outliner tool)
• New Samples (Iron Python now does Web Sites and Web Application Projects)
• Updated less-restrictive license
• Freely available on Microsoft download site.