The new ypbind changes requires that the domainname be set before

rc.conf is run.  There's no real downside.
ok aja

src/etc/netstart

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: netstart,v 1.133 2011/07/07 23:09:46 guenther Exp $
+#	$OpenBSD: netstart,v 1.134 2011/10/07 16:36:26 deraadt Exp $
 
 # Strip comments (and leading/trailing whitespace if IFS is set)
 # from a file and spew to stdout
@@ -195,10 +195,6 @@ else
 	hostname=`hostname`
 fi
 
-if [ -f /etc/defaultdomain ]; then
-	domainname `stripcom /etc/defaultdomain`
-fi
-
 # Set the address for the loopback interface.  Bringing the interface up,
 # automatically invokes the IPv6 address ::1.
 ifconfig lo0 inet 127.0.0.1/8

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.394 2011/10/06 20:49:25 deraadt Exp $
+#	$OpenBSD: rc,v 1.395 2011/10/07 16:36:26 deraadt Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -221,6 +221,11 @@ INRC=1; export INRC
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 export PATH
 
+# must set the domainname before rc.conf, so YP startup choices can be made
+if [ -f /etc/defaultdomain ]; then
+	domainname `stripcom /etc/defaultdomain`
+fi
+
 # pick up option configuration
 . /etc/rc.conf