First, apologies for the problems that some users are seeing with getting OneNote to connect to SkyDrive. We've heard these reports and are trying to get to the root of the problem. If you are experiencing this problem when trying to sync to SkyDrive and if running OneNote in “Windows XP Compatibility mode” allows OneNote to sync successfully and want to help, please click the "Email Blog Author" link at the upper right to contact me. I will follow up in email.
Again, apologies for the frustration.