Google Calendar Sync for Outlook (version 0.9.3.6) now supports Outlook 2010. Outlook 2010 comes in 32-bit and 64-bit versions, and currently only 32-bit is supported.
For more information:
Note: If you’re already using Google Calendar Sync, you’ll need to download and install this new version in order to be able to sync with Outlook 2010. This is a standalone sync tool for Google Calendar only.