The first time I found your site, I used one of these for my production server VMs and it worked out great for a years. I used an non-LTS version and there are no more critical updates. That's why I choose Ubuntu 10.04 LTS.
Even though its quite old, Ubuntu 10.04 LT is still more up to date than CentOS/REL 5.xx .
I actually don't need it anymore, because the perfect setup guide for Ubuntu is very easy to run though.
I setup two servers using your guides over the weekend. Your guides are always excellent. I also bough your billing module.
Glad I can help support howtoforge.