After downloading all the new Microsoft tools I told you about on August 1st, I was a bit confused about how best to set up for Silverlight development. It was clear to me that Visual Studio 2008 beta 2, the Silverlight Alpha add-ins for Visual Studio 2008, and the Expression Blend v2 August Preview were the right tools for developing Silverlight 1.1 applications with the Silverlight 1.1 Alpha refresh SDK. But w But what about Silverlight 1.0? Do the two SDKs install side by side? What are the best tools for Silverlight 1.0 development? So I asked Microsoft, through the PR person assigned to the Silverlight account.The advice I got back was simple: use the Silverlight 1.1 development tools to target either 1.1 or 1.0. The two SDKs do not install side by side, although you can certainly install them on separate machines or in separate Virtual PCs on the same machine. However, Silverlight 1.0 is a proper subset of Silverlight 1.1, and the tools let you target either one.There is one small disadvantage of doing this: the Silverlight 1.0 RC client updates itself automatically, but the Silverlight 1.1 client does not. Technical Evangelist Tim Sneath explains: If you’re running the 1.1 builds (as I’m sure most developers are), we don’t auto-update your machine. Since you’re on the “development” fork, we require you to manually update your machine (simply run the install from the link here and your machine will get the latest bits). The current 1.1 bits are v1.1.20806.0 (the build number matches, just the major and minor version numbers are different). Software Development