To help get you started with Eucalyptus, we have provided links to pre-packaged virtual machines that are ready to run in your Eucalyptus cloud. Clicking the link will download a package that contains a VM image (*.img), a Xen compatible kernel/ramdisk pair (xen-kernel/vmlinuz* and xen-kernel/initrd*) and a KVM compatible kernel/ramdisk pair (kvm-kernel/vmlinuz* and kvm-kernel/initrd*). Once you have downloaded an image, you can bundle, upload and register it for use in your Eucalyptus cloud. Please refer to this guide for more instructions.
Once you've selected and downloaded the image(s) you plan to use, visit the Eucalyptus Image Management guide for details on how to bundle, upload and register the images with your Eucalyptus cloud.