PortableApps is a suite (like U3) that runs off of your thumbdrive/USB Mass storage device, but it is completely FREE! I use this all the time with my Flash Voyager 4gb and it works like a charm. There are a lot of apps supporting it and you can add new ones easily (by going to program files directory and copying folders to ?:/PortableApps.)
Try it out, it works great!!
