Ubuntu Server 12.10 x86 is here

You can download the image here.

CentOS 6.3 is here (Gnome x86)

You can download the images here

Ubuntu Server 12.04 x86 is here

You can download the image here.

Fedora 17 is here (x86)

you can download the image here

 

Ubuntu 12.04 LTS Precise Pangolin is here (x86)

You can download it from here.