Silverlight Version 2 developer runtime along with the Silverlight Tools is now available. This release candidate will give developers the chance to convert their sites from Beta 2 –> Release before the final release of the runtime is out. Also, included below is a link to a patch that will upgrade Blend.
Also, a document detailing the breaking changes between Beta2 and Release can be downloaded here. Below I have outlined a high level overview of the content from this document. If you need further details on a particular breaking change, please refer to the document.