Photoshop is about to turn 20 years old... yet it seems like yesterday when I had to run it off a floppy disc. The fine folks over at Webdesigner Depot offer 20 Years of Adobe Photoshop with some great tidbits and history.
"The first version of the Photoshop splash screen features just four Photoshop programmers. In subsequent versions, more and more names are added to the list. In more recent versions, a limited number of Adobe VIP’s appear in the splash screen."
You should also check out this great interview with John Knoll, one of the two inventors of the application.