Calendar App that I can send appointment to others

I am new to the Android operating system having come over Blackberry a week or so ago. I want to find an app to use instead of the stock calendar that comes with my Droid X. One feature I havent been able to find in a calendar is the ability to send the appointment to my wife so we dont miss anything.
Does anyone know of a good calendar app that would allow me to send an appointment when I am entering it into my calendar?