Yet another way to share Outlook calendar events is to have a look at Blogwave [1] in conjunction with a calendar adapter [2]:
BlogWave is an \”RSS Generator\”: a tool which can pull information from a variety of sources and publish it as RSS. This process is very easy to configure and can be scheduled to run automatically. For example, using BlogWave you can create an RSS feed from Sharepoint announcements on your company\’s internal site. Or you can publish event logs as RSS.
Other approaches are outlined in CalendarTools.
[1] http://weblogs.asp.net/asanto/archive/2004/09/26/234512.aspx
[2] http://blogs.msdn.com/tristank/articles/Outlook_Calendar_for_Blogwave.aspx
