Even with JavaScript enabled the sign up process is still nasty! There is no feedback to suggest the button has actually done anything. I ended up with three "join up" emails: one for the first click on the top button, one for the second click when I thought I'd missed the button or something, and one for the click on the duplicate button at the bottom of the page because I thought the top button was broken. By that time the first email had arrived!

Maybe it's because the page is 'Python powered'?