I also realized that many many people must be making this comparison, and sure enough it's in Wikipedia: http://en.wikipedia.org/wiki/Comparison_of_VMware_Fusion_and_Parallels_Desktop

Parallels 3.0:

  • support for cross-OS file associations (SmartSelect)
  • better utilities such as a snapshot manager

VMWare Fusion 1.1:

See also MacNotes and LaptopNotes