The latest, greatest CTP for WinFX is available for download here:
There is a link to the WinFX SDK and to the matching version of VS 2005 (Beta 2) available on that page as well.
Everything should be ready for download (including the SDK) now (some early birds had a few issues this weekend). The online documentation will be updated in pieces a bit later so I recommend relying on the downloadable SDK for now.
We've been getting lots of good feedback on the SDK documentation--please keep it coming!