Pentium v. P4
A PC with a new 3 Ghz Pentium III is faster at video editing (and probably lots of other things) than a Mac with a 1.25 Ghz P4. While this may matter for all the video editors who live between QuickTime Pro and a clustered Lintel blade farm, most home consumers stopped caring how fast their computers were about 2 Ghz ago. This is because most important applications are now being written to the Internet Operating system, not Win32 API, nor MacOSX API, or anything else. And with Internet Operating system applications, what matters is not local processing ability, but bandwidth.