Congratulations on launching. The UI looks good, but I do have some comments:

1) The time counter, it flashes. Very distracting. I see you're using a plugin for it. Just have the background stays the same and change opacity of the text instead.

2) Facebook and Twitter links next to the signup/signin button can be confusing as social authentication. Perhaps you could move it down to the footer or above the Facebook friends/like box.

Congrats again and good luck.