The recent question about MTAs was best answered in a general *NIX forum - as it was, it got asked twice and answered twice.
What I've seen is a lot of discussion about General UNIX Stuff, rather than "Linux this" or "AIX that". AIX ain't UNIX anyway. It's some weirdass strange thing that happens to have ksh as its shell :-)
My point is that we've got so many damn fora it's hard for a noob to work out what goes where, and hell, I'd like to check less fora - even if each forum has more posts.