Office 2007 and OneNote 2007
Just finished downloading and installing these new products (from MSDN subscriber downloads). Automatic upgrade to newer version is supported, but it won't work if you have any pre-release versions installed. I had the beta Compatability pack for Office 2007 file formats installed, which I had to uninstall to get the automatic upgrade working.
My initial reaction is "wow". Go ahead download and try it out yourself. Along with Office suite of products, even OneNote has added lot of new features. If you aren't already using, give it a try.