Mobile Air Mouse is an iPhone/PC/MAC app developed by RPA Technology, it consists of an iPhone/iPod Touch side app, and a PC/MAC server program.
These two apps let you use your iPhone or iPod Touch as a track-pad, and "air mouse" for your PC or MAC, and also functions as a wireless keyboard.
Having the PC server side program portable would make setting up the mobile software pretty easy, as you would just need to run it from a flash drive, instead of installing it directly to the computer.
Program Site: http://www.mobileairmouse.com/index.html
i heard of this and i have this odd feeling it cant be made portable. probibly will need admin rights and/or access to some drivers or the registry. i could be wrong, this is what i remember hearing from a friend who tried it on a computer they did not have admin rights on.