Earlier this afternoon Apple released iMovie v7.1.2 and iDVD v7.0.2.
iMovie has general compatibility fixes (QuickTime 7.5?), overall stability issues (the Color issue evident w/ 10.5.3?), and addresses a number of other minor issues.
iDVD has general compatibility fixes (QuickTime 7.5?), overall stability, and a number of minor issues.
Niether update shows up in Software Update unless you already have QuickTime 7.5 installed. Enjoy, Alex.