This is not as much a request but more of a post of an application I found very useful on a flash drive and could be optimized for PortableApps.com
Blender is a free open source 3D content creation suite, you can access the site at http://www.blender.org/ . Blender is a very intuitive program with shortcuts easily placed at the left hand home position. It only took me a few days to learn the ins and outs of this program. There are wiki's and video tutorials which are all very helpful, but some are outdated. This is a very powerful tool and will run on almost any XP system, even slower ones, the only exception being when you want to render a scene it takes longer with slower systems. I have loved being able to access my projects at a moments notice when I am away from my home computer or my laptop.
The installer installs the program to the PortableApps folder to where it can be viewed in the program menu. If you do not see it at first, open the directory and copy the ENTIRE FOLDER which contains the Blender.exe file in it into the PortableApps folder and it will run fine.
Blender will not function properly on Windows Vista. I have tried it and ran into a few snags which caused it to close and lose all of my date, namely when you render the scene. I would not recomend running this on Vista until an update with compatibility is released.