Online version Amibroker user guide:
http://www.amibroker.com/guide/

Ami broker AFL:
http://www.amibroker.com/guide/AFL.html
and the tutorial:
http://www.amibroker.com/guide/tutorial.html

Amibroker boards:
http://www.amibroker.org/boards/

Yahoo boards:
http://finance.groups.yahoo.com/group/amibroker/
http://finance.groups.yahoo.com/group/amibroker-afl/
http://finance.groups.yahoo.com/group/amibroker-ts/
http://finance.groups.yahoo.com/group/amibroker-dll/

An internet archive of the mailing list:
http://www.purebytes.com/archives/amibroker/