Boyd Stephen Smith Jr. wrote:
I suggest cdn.debian.net for the official archive and security.geo.debian.org for the security archive. Both are GeoIP-based to find the closest mirror to you, although cdn goes an extra step and also takes into account how up-to-date and heavily-loaded the mirror is.
Note that security.geo.debian.org will be dropped on july [1]. It's now active at the normal address (security.debian.org).
1: http://dsa.debian.org/dsablog/2010/05/Dropping_security.geo.debian.org_zone/