Check your Software Update preference pane (or click the links below), as Apple released iLife updates today.
This update to iMovie HD 6 addresses issues with Ken Burns rendering performance, scrubber bar editing performance, theme image quality, PAL audio, and displaying iLife Sound Effects automatically in its iLife Media Browser. It also improves overall stability and addresses a number of other minor issues.
This update to iDVD 6 resolves issues with integration with the other iLife applications, importing of legacy projects and some theme related issues. It also addresses a number of other minor issues.