Other options include:
1) Calendar Sync http://www.pppindia.com/calendar-sync/index.html
2) Outlook Google Calendar Sync https://outlookgooglesyncbidirectional.codeplex.com/
3) More options here http://www.pcadvisor.co.uk/how-to/software/3500196/how-sync-google-outlook-calendars/
If you have other suggestions for syncing between Google and Outlook, drop us a line at email@example.com. Otherwise, keep your eyes peeled for our Exchange support soon. You can leave us your email at do.com/login to be notified when we launch on Outlook.
Don't worry - we'll make this a lot easier pretty soon :)
PS - If you were looking for an Apple iCal / Google sync, here's the article for that http://help.do.com/knowledgebase/articles/427881