¿Cuantas versiones de Adobe photoshop hay?

Adobe Photoshop 1.0 

Adobe Photoshop 2.0

Adobe Photoshop 2.0.1

Adobe Photoshop 2.5

Adobe Photoshop 2.5.1

Adobe Photoshop 3.0

Adobe Photoshop 4.0

Adobe Photoshop 4.0.1

Adobe Photoshop 5.0

Adobe Photoshop 5.0.1

Adobe Photoshop 5.5

Adobe Photoshop 6.0

Adobe Photoshop 6.1

Adobe Photoshop 7.0

Adobe Photoshop 7.0.1

Adobe Photoshop CS (8.0)

Adobe Photoshop CS2 (9.0)

Adobe Photoshop CS3 (10.0)

Adobe Photoshop Express

Adobe Photoshop CS4 (11.0)

Adobe Photoshop CS5 (12.0) (proximamente)

Adobe Photoshop CS6 CC (Creative cloud)