List as of April 2011

Full mirror:

ftp://208.185.231.250/pub/apple_II/
ftp://public.asimov.net/pub/apple_II/
http://ftp.crihan.fr/crihan/apple.asimov.net/ftp.apple.asimov.net/pub/apple_II/

partial mirror:

http://mirrors.apple2.org.za/ftp.apple.asimov.net/
ftp://www.macbsd.com/pub/ftp.apple.asimov.net/pub/apple_II/
ftp://lahtermaher.org/pub/emulators/apple/