Hrm, just tested it on Chrome on my Mac and it worked. We're using Launchrock to collect signups. Maybe they were down temporarily? Try again or email us directly at greentealabs@gmail.com. Thanks for your interest!
Tried again just now - same problem. Looks like some sort of a persistent issue with Launchrock, I mustn't be the only one hitting it.
Hrm, that is weird, we got a lot of other sign ups on Launchrock. Pls email us at greentealabs@gmail.com. Can you give some details on your browser too. I'll report to Launchrock. Sorry for the inconvenience.