Earlier I blogged about how to sync my Outlook and Google calendar using Plaxo. This has worked very well for me but now Google has released their own tool to do the same thing.
One of the interesting features that this tool allows is the ability to do 1-way synchronization. You can get more information on how to set it up here.
For now I'm going to continue to use my Plaxo setup since it already meets my needs. But if you're interested in a solution for Google and Outlook calendar synchronization that doesn't require opening a Plaxo account, then Google Calendar Sync will be worth downloading.