As other people noticed, finding good documentation is a little hard but more importantly getting help is not easy at all. I asked for help in a few related newsgroups but the answers I got were not terribly helpful.
Since Xaw is so ugly, almost nobody learns Xaw and X Toolkit Intrinsics. Everybody is attracted by the nice Look of Qt or gtk, but both of them are not Xt based but have their own basic framework.
Motif is, as well as Xaw, X11 Toolkit based, but as a comercial product lots of people prefer something free.
Lesstif.
Since Motif is almost as old as Xaw, lots of newer UI features are missing there, too.
Untrue.
-Dave
-- Dave McGuire "I've watched Harley people throw up Cape Coral, FL on the ceiling." -Krissi