I would love to see one more feature added to the calendar.  A component that quickly allows you to Filter the calendar.  The component would list the Event Sources in a UI friendly way and the end user could quickly click the event source on or off. (I think we should be able to choose which method).  On some pages having all data sources load initially can really bog down the calendar.  In other cases loading everything is the best choice and then filtering down from there. I think this would make the calendar so much more functional and UI friendly.  

The component could be placed in the left or right column of a Panel set.  Or in other cases placed in a pop-up.  It would be super cool!

Thanks!