After reading many blogs, and trying for a while before succeeding, in creating an Ubuntu 9 pv template on xen, i have finally got it working, and have created a template which runs in PV mode, has the xentools installed and is avaliable for download for free.
A paravirtualized Citrix Xenserver 5.5 template for Ubuntu 9.04 x32,
you can find more templates in the templates page above.
download the following files extract them with 7zip and import the xva via xencenter..
The template is a bare ubuntu installation and has ssh-server installed, it is set to obtain an ip from dhcp, and works in PV mode,
please let me know if you run into any problems
More templates to follow