Portable Applications
Recently, I found out the world popular photo editing software Photoshop has a portable version that can be store in our USB flash drive.
Portable Photoshop CS3
Photoshop is bundled with PortableApps.com launcher, a free and open source software you can use with any storage device like flash drives or external hard disk. So when you combine a portable app with Photoshop, what you will get is a super fast, no licence needed and free software application. Try to download it.
You may also try a variety of application such as browser such as Firefox (Portable Firefox) and other application software.