aros on Facebook - Yes, it is true. We are on face :P
aros homepage - Lots of info about AROS
aros-exec - AROS forum where you can ask about anything related to AROS (AspireOS).
amigaworld - Amiga, MorphOS, AROS forum.
aros playground - Game related AspireOS(AROS) page.
arosworld - AROS forum, news and more.
icaros desktop - AROS distribuiton.
portableE - Programming language.
There is an official IRC channel for AROS, named #aros, on the FreeNode network. Please connect to irc.freenode.net, which will redirect to a server close to you. It's for discussing everything and anything related to AROS.