Google Calendar sync now (mostly) works with Outlook 2010
Sync only works with 32-bit installs of Outlook 2010, though to be fair even Microsoft recommended that users roll with that version to prevent plug-in compatibility issues. 64-bit support will likely come later on -- when 64-bit Office installs are a bit more commonplace.
The updated app supports both two-way and one-way syncing, meaning you can push items from your Google Calendar to Outlook or vice versa, or keep them running in unison. Check out the official blog post for more details and the download link!