I Have PSD from Hyperakt on Vimeo.
Link to Henry Hadlow‘s site. Previously: Photoshop Adbusting in Berlin Adobe Photoshop CS4 : As real as it gets PhotoShop Toolbar Evolution You Suck At Photoshop #20 — Final episode, Donnie is Dane Cook!
Evolution of Photoshop. Over at Hongkiat there are other of examples of PhotoShop’s evolution, the application icon, the startup/splash screen and the desktop appearance.
If you are not familiar with this series you should watch them all in sequence. You can find more episodes here.