The iMovie Plugin Pack 2.1 contains a set of effects, transitions, and titles that you can add to iMovie for Mac OS X.
New effects include Flash, Ghost Trails, Mirror, Mirror Advanced, and N-Square. New transitions include Circle Closing, Circle Opening, Radial Warp In, Warp Out, Wash In, and Wash Out. New titles include Subtitle, Subtitle Multiple, Zoom, and Zoom Multiple.
Version 2.1.1 includes unspecified updates.