been having a play with a few of the available JeOS distributions. For those not yet familiar with the terminology, a JeOS (pronounced "Juice") is a very cut-down version of the distro that is designed for a very small footprint install onto a virtual server. Some of the installs are very small. reason? you dont need all that bloat of a full operating system if its running in a virtual environment. Some of the JeOS available are: Ubuntu, SUSE. Not sure about Ubuntu LTS certification but SUSE state that anythign certified for SUSE Enterprise will also be cert'd for their JeOS drop too.