Windows/Platform SDK Express Install
I was busy setting up a laptop with Vista RC1 and wanted to install Cider and the workflow addons for Visual Studio 2005. These require the Windows SDK to be installed as a prereq. I decided to give the express online installer a go. I downloaded and ran the setup file directly (not by saving first). This was a small download (under 1MB). I was then able to select what I wanted to install. I went for as little as possible - selected the zipped sample and the .NET utils. Did not install the doc or any C++ stuff.
I must say I was impressed with it. About an hour later the install was done and I could install Cider.
I would interested in any feedback if you tried this rather than downloading the 1GB Platform SDK.