I believe there is no way to fetch set of packages baesd on
	dependencies.  (for example, autoconf depends on m4, so it would be
	nice if one can get autoconf and m4 by saying "get autoconf, and
	all packages autoconf is depending upon")

	I find this URL can be useful (some part is written in Japanese).
	http://home.jp.FreeBSD.org/cgi-bin/showmail/ports-jp/7184
	http://home.jp.FreeBSD.org/cgi-bin/showmail/ports-jp/7188

itojun