Download URLs for templates are just wrong in VE 1.1 webadmin download section:
http://download.proxmox.com/appliances/system/centos-4-standard_4-2_i386.tar.gz
should be
http://download.proxmox.com/appliances/system/centos-4-standard_4.7-1_i386.tar.gz
http://download.proxmox.com/appliances/system/centos-5-standard_5-2_i386.tar.gz
should be
http://download.proxmox.com/appliances/system/centos-5-standard_5.2-1_i386.tar.gz
These are just 2 examples - as there are more broken links...
http://download.proxmox.com/appliances/system/centos-4-standard_4-2_i386.tar.gz
should be
http://download.proxmox.com/appliances/system/centos-4-standard_4.7-1_i386.tar.gz
http://download.proxmox.com/appliances/system/centos-5-standard_5-2_i386.tar.gz
should be
http://download.proxmox.com/appliances/system/centos-5-standard_5.2-1_i386.tar.gz
These are just 2 examples - as there are more broken links...