I'm still a little in the dark about what moves a plural and singular form keyword in Google rankings because while my plural form keyword is at no.2, my singular one which I've been trying to hammer away at with paid/free directory submissions, blog comments, reciprocal and one-way links with relevant sites, won't budge. I'm pretty much doing the same thing with the singular form as I did with the plural form, but it doesn't seem to work as effectively for the singular for some reason. Why is that? Thanks for any help.