http://smartic.us/2007/2/11/show-us-your-gems http://www.robbyonrails.com/articles/2007/02/12/gems-gone-wild http://www.clarkware.com/cgi/blosxom/2007/02/10#GemSurvey http://www.chadfowler.com/2007/2/11/show-us-your-gemsってそんなに多くは…