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To pull in a specific calendar right now requires that you turn on sharing in MobileMe. Go into with a web browser, to the calendar app, and then click on the little circular radio waves icon next to the calendar. Choose 'Public Calendar' and press the 'Share' button.

The popup window will then say 'Your calendar is now available at:' a webcal URL. You can copy and paste that URL into OmniPlan's 'vacation events from web calendar' action settings.

Hope that helps!