Since UtilityBase went down, I think there has been a gaping hole, because there is nowhere that coders from all Amiga-like OSes can help each other (by sharing knowledge & experience).
OS4Coding.net is fine for AmigaOS4-only topics, but what if you have a problem that applies equally to AmigaOS3 (and thus also AROS & MorphOS)? You could probably get more (faster & better) answers if there was a forum that welcomed coders of all backgrounds.
AmigaDave has suggested the following "social group" on Amiga.org, which acts as a kind of "mini-forum" where only members of the group can post:
http://www.amiga.org/forums/group.php?groupid=44You need to be registered for Amiga.org, then you can just click to join this group. Joining appears to be automatically approved, but in the unlikely even of there being any trouble-makers, they can be (permanently) kicked from the group.