(this would fit in all 3 categories but I went for pacman)
Now that 0.7.2 isn't far away I took a look at pacman's mirror list to see how they all match up. Here are some notes...

=> ftp-linux.cc.gatech.edu/ftp.oss.cc.gatech.edu/...
"Please do not use the old names ftp-linux.cc.gatech.edu, www.gtlib.cc.gatech.edu, ftp.gtlib.cc.gatech.edu or rsync.gtlib.cc.gatech.edu as they are now depricated and may cease to exist.
The new names for GTlib services are www.gtlib.gatech.edu, ftp.gtlib.gatech.edu and rsync.gtlib.gatech.edu."
I couldn't find Arch on any server because most directories were inaccessible or I couldn't connect in the first place.

=> archlinux.antesis.org
wrong paths, totally out of sync

=> ftp.rez-gif.supelec.fr
could not connect

=> ftp.archlinux.de
see http://bugs.archlinux.org/task/4440

=> ftp.mpi-sb.mpg.de
wrong path, mirrors incomplete ibiblio/sunsite/metalab without Arch

=> ftp.tu-chemnitz.de
3-4 days behind

=> ftp.surfnet.nl (=ftp.nluug.nl)
old files are being kept, good for downgrades

=> sunsite.icm.edu.pl
keeps old files, no [testing]

=> ftp.fsn.hu
archlinux/ doesn't contain any files

=> ftp.kegep.tuc.gr
couldn't connect

=> ftp.estpak.ee
keeps old files, http://ftp.estpak.ee/stats-ftp/ might be interesting

=> saule.mintis.lt
incomplete, no version dirs and no isos

=> mirror.pacific.net.au
see http://bugs.archlinux.org/task/4596 or http://bbs.archlinux.org/viewtopic.php?t=21218

=> cle.linux.org.tw
incomplete

A few mirrors are on http://www.archlinux.org/download.php but not in pacman's list:
- ftp.parrswood.net
- mymirror.asiaosc.org (incomplete)
- ftp.ds.hj.se
- mirror.cs.vt.edu

If there is interest I could search for some more Ibiblio mirrors, preferably in not yet listed countries.