CyberLink announced this morning that PowerDVD Ultra and PowerDirector have been optimized for Intel's Core 2 Quad processor. Here's part of their press release:
CyberLink Corp. (5203.TW), a leader in digital home solutions, announced significant performance gains for playing, analyzing, and producing high-quality video content using CyberLink's leading applications on systems featuring the Intel Core 2 Quad processors.

CyberLink's optimization of the Blu-ray Disc and HD DVD playback software PowerDVD Ultra improved frame-rate performance by up to 66%. Automated video editing software PowerDirector improved editing and transcoding times by up to 68%. All software was tested in controlled conditions and was verified with significantly improved performance on Intel's quad-core technology.
If you'd like to read more, CyberLink's entire press release can be found here.