The really quick and easy way to do this is to have everyone run Outlook 2003 and use the "Link to Outlook" button on the Windows SharePoint Services event list to add that list as a calendar folder to Outlook.
All other methods would require custom code solutions;

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Is there a way to automatically post a Sharepoint Event from a calendar to
> Outlook (either 2002 or 2003)? Using Sharepoint, not Portal version. Would
> like secretary to post schedule to Sharepoint Calendar which is automatically
> distributed to Outlook calenders of users in her office.