Have you been trying to register for a Google API license key? I bet you couldn't register a key in the past week or so. According to a thread over at Google Groups named Cannot recieve my API licence key, PLEASE HELP!, this has been a problem for at least five days.
I have noticed, as well as DigitalPoint, a drop in sign ups for our tools that require an API key. Interesting find, thanks to DP for the heads up.