Moral of this story: If you rely heavily on Adobe professional apps, you will NOT see a performance increase by moving to the Intel Macs. We all need to start bugging Adobe to get UB versions of Photoshop and After Effects finished for the Intel Macs. The need will be even greater when the Intel based towers are released by Apple -- which are rumored to be coming as early as September 2006.
If you're in the mood for benchmarks you should also check out Bare Feats' Mac OS X versus Windows XP Pro Boot Camp Shootout where they test how well Windows apps run compared to the same apps under Mac OS X "Tiger." (Spoiler: The Mac beat Windows on four of seven native tests and performed respectably in the rest).