This Jack Dangermond quote (paraphrased maybe?) comes to us courtesy of Sean McGinnis (blog) and his entry on Day 1 of the ESRI Homeland Security Conference. Says Jack:

So, the difference between Google Earth, Microsoft Virtual Earth and ESRI's ArcGIS Explorer (AGX) is in the content they serve. To me this sounds like saying that WordPerfect is the word processor for poetry, while Microsoft Word is better suited for prose.