This video shows what you need to make your AddIns ready for the AddIn Manager and package them as ".sdaddin"-files.
AddInManager.wmv (2,37 MB; 05:12 m)
It uses the Image Viewer addin from the third AddIn-writing tutorial.
MyTestAddIn.AddInManager.zip (4,53 KB) - source code of the test AddIn
ImageViewer.sdaddin.zip (2,92 KB) - binary package of the test addin (remove the ".zip" extension, it's just there because this blog doesn't accept ".sdaddin" files)
There is a bug SharpDevelop 2 Beta 1 which causes the AddInManager to crash when opening the .sdaddin-file created in this video. It has been fixed in build 940, so make sure you get a recent build from the build server.