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.

username= root
password= password

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