Xubuntu 8.10 i386 Alternate CD includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure. It can be used only with 64bit machines.
Xubuntu is a community developed operating system that is perfect for laptops and desktops. Whether you use it at home, at school or at work Xubuntu contains all the applications you'll ever need, from word processing and email applications, to web server software and programming tools.