Apple has released QuickTime 7.0.4 and iTunes 6.0.2.
Both releases are designed to support the new versions of iLife '06 and iWork '06. The QuickTime 7.04 update is "highly recommended" for all QuickTime 7 users, mainly because it contains some security fixes.
They also offer H.264 performance improvements; while the iTunes update is described as a stability-improving release.
Both releases are available through Software Update.