Grammar Girl

I went to 10 different schools between Kindergarten and 12th grade. Due to all the moving, I never had a formal study of English grammar. I've done well writing by ear, but I know I make mistakes all the time. Since I don't have to write academically anymore, i have gotten sloppy and my ear is failing me. I just saw Grammar Girl on Oprah and am bookmarking the site for future reference.