[plug] Boxgrinder,VMBuilder or OZ

[Alex]

Hi all,

I am looking for a solution to generate centos/rhel based vm images 
which can be deployed on EC2, XEN and VMWare. I found this article which 
mentions a number of such tools.

http://docs.openstack.org/image-guide/content/ch_creating_images_automatically.html

I was wondering there are any fellow pluggers who have tried any of 
these already and what their experience was. Boxgrinder hasn't been 
updates in some time and seem to no longer be under active development. 
VMBuilder doesn't seem to support centos/rhel. Oz looks interesting, but 
also hasn't been updated recently.

Any other suggestions are welcome as well.