I’d post that one but they want me to send and e-mail for an invitation and they already have my email with a registration, so I see no reason to repeat.
My gripe here is with the dark text with insufficient contrast. The white glow making it look inset doesn’t make it more readable. And that on a site called Usabila.
P.S. Although I didn’t need a helping tool for this example (my eyes were sufficient) I would like to note Chrometric — a very useful little tool for giving you an idea how your site looks through they eyes of people with some visual impairment.