I've uploaded new versions of Managed Add-Ins and the Reflector Add-In. I've added a 'Quick Launch' menu to quickly start and stop your add-ins. I think this was needed before going properly beta (i.e. feature complete). You can dowanlod the new versions from here.
Just for fun I've also made Wahoo! available out of the box. Could you comment here if you know of any other utilities and games that are runnable from a URL?
Remember to press the save icon after adding new add-ins. Also the quick launch menu is only populated when VS.NET first loads. I know this isn't ideal, but it works for the moment.