Import & Export Outlook Appointments into Google Calendar
Microsoft has a nice tutorial on how to move calendar information between Outlook and Google Calendar.
Google Calendar Synchronization
Google has released a synchronization tool that allows, one-way and two-way scheduled synchronization between Outlook and Google Calendar.
Copy Appointments from Emails or Web into Outlook
We're always being notified of business meetings or upcoming events by email. Copy2Contact™ can quickly add these items to your Calendar, in one simple step. Select the text that describes the event and its date and time. Then press Copy2Contact’s™ shortcut key (normally control-c twice quickly) to ask Copy2Contact™ to create a new appointment on your Calendar.