Apple has released a set of plug-ins for iMovie for Mac OS X.

The collection, called iMovie Plug in Pack 2.1, adds several new video transitions to iMovie's video editor. It also provides a number of titling and effects options.

New effects include Flash, Ghost Trails, Mirror, Mirror Advanced and N-Square. Transition effects include a Closing and an Opening Circle, Radial, Warp In and Out, and Wash In and Out.

The Pack also offers new titling options, including Subtitling and Zoom options. The plug ins are available for download, and are intended only for the Mac OS X version of iMovie.