Open Source Calendar
I have had the opportunity to take the open souce ext_calendar component (http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,96/Itemid,35/) and make some significant modifications to it. I cleaned things up fairly considerably for creating search engine friendly urls, and I ported the event administration to the back end. My goal is to turn around and release this one to open source. I'll see if I can't address some of the other user concerns and clean up the code more, but this could be/should be a nice contribution back to the open source community and make this calendar a lot more usable right out of the box.