a little update! I have upgraded to ESXi 4.0 without any troubles. Everything is working as expected. Also the Intel-VT work as it should. At the moment i am running an Astaro Firewall, Windows Home Server (32bit), Windows Server 2008(64bit), CentOS 5.3 (64bit) and an Debian 5 (64bit).
Thanks to Sohrab.Kasraian for his guide Extracting Data From ESXi 4.0
for my previous post