I'm on a relatively high-DPI display and when I went to sign up for an API key, I zoomed in a couple steps in Chrome so I could better read the text. Once I hit "Accept" at the bottom, I was presented with a form that was quite broken. See this screenshot:

http://i.imgur.com/1f9pKj7.png

It took me a few minutes to realize that the form was broken because I had zoomed in. Ctrl-0 fixed it right up. Other people might not realize that, especially if they've got fonts zoomed by default. Just an FYI.