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If you are willing to write code it's certainly possible. In Leopard there is a nice framework for accessing the shared calendar store the iCal uses. You could write a little app that accesses this and chruns out the chunk of HTML you need.

If you mean: is there a built in way: no.
 
Can't you publish your calendar through ical in 10.5 with the publish option? Doesn't it let you publish it to your FTP site?

The Stig
 
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