We (Login Inc.) have setup a new 1Gbps Ubuntu mirror, we are a official release/archive mirror for ubuntu now. HTTP/FTP/RSYNC are all provided.

http://mirrors.login.com/ubuntu
ftp://mirrors.login.com/ubuntu
rsync://mirrors.login.com/ubuntu

http://mirrors.login.com/ubuntu-iso
ftp://mirrors.login.com/ubuntu-iso
rsync://mirrors.login.com/ubuntu-iso