As far as I can tell (which is not much), Yale is into representation theory. I am very interested in number theory, and when I looked at their site in August, the only links they had were to things like TA tips, .tex files for theses, etc. When it comes to information about their graduate program and research interests, absolutely no content. I e-mailed the person it said to e-mail twice back in August and never got a response. It'd be a reach for me anyway, and I'm not giving them $100 or $90 or whatever the application fee is just to get rejected.