Carry your favorite operating system around in your bootable external hard disk where ever you go. With the Ubuntu Live Hard Disk you can boot into Ubuntu 9.10 Live loaded on the hard disk from any computer. The best part is that you will have persistent storage. Unlike in a live CD where you cannot save your preferences or documents you can use your Ubuntu Live Hard Disk just like you would use your Ubuntu installed in a computer. Also have the luxury of having the complete Ubuntu repository right in your hard disk drive so that you would not have to connect to the Internet to install additional software.
You might also want to check out the Ubuntu 9.10 repositories on DVD.