Portable Adobe Photoshop CS4 :D

Portable Applications is the generic name for software that has been customized so that it does not need to be installed on a computers drive to operate. You can simply run it from any portable device such as an USB flash drive, external hard drive, iPod/MP3 player and etc. You can carry it around with you in your pocket, run it from any computer with USB access. While you are using it, you have access to your software and personal data, just as you would at home or at the office. When you are done using it, none of your personal information is left behind on the computer you used.

You don't need Additional Software to run the Portable Apps, Just download, save it to ur Portable Device, run the portable installer and go!

Download Link
Adobe Photoshop CS4