Bjornstrom, you're certainly not the only Mac user here, and in fact iCalendar is an open standard for exchange of calendar data and not just for iCal on Macs.
That said, I'm also looking for a solution to publish vB calendar to an iCalendar format/file/server so my users can subscribe to it with their calendar software including iCal on Mac.
If someone was entrepreneurial, and I would have a stab at it if I had more time, they would have to write something that does a query of the vB database and puts it out as an iCalendar file. I don't think that would be too hard, but I'm certainly not an advanced programmer
Perhaps this exists somewhere but I cannot find it.