Apple has released iMovie Plug-in Pack 2.1.1 for Mac OS X, which contains a set of effects, transitions and titles that you can add to iMovie for Mac OS X.
iMovie is, of course, the entry level video editing application that ships on all new Macs. Note that the pack is only for use with iMovie for Mac OS X and can’t be used with iMovie on any previous version of the Mac OS.
The pack includes the following new effects, transitions and titles:
Effects: Flash, Ghost Trails, Mirror, Mirror Advanced, N-Square;
Transitions: Circle Closing, Circle Opening, Radial, Warp In, Warp Out, Wash In, Wash Out;
Titles: Subtitle, Subtitle Multiple, Zoom, Zoom Multiple
download iMovie Plug-inPack 2.1.1 for Mac OS X
(a 480k file) at the AppleCare Knowledge Base Web site.