I found I kept needing to switch back and forth between installing 
from pkgsrc and using pkg_add, which requires unsetting and 
setting PKG_PATH. So I am trying this as a function in my .bashrc: 
it will set my PKG_PATH variable, pass the command line argument t 
the real pkg_add command, and then unset PKG_PATH again.

function pkgadd {
         export 
PKG_PATH=ftp://ftp.netbsd.org/pub/NetBSD/packages/1.5/i386/All
         /usr/sbin/pkg_add $*
         unset PKG_PATH
         }

Is there an easier or smarter way to do this? I suppose if I find 
myself doing this a lot, I'll need to accomodate multiple 
arguments and stuff them into a for loop, but I'll build that 
bridge when I get there.