Yesterday, my company Hipster (useHipster.com) put up a "coming soon" page. We wanted it to be more than just a regular coming soon page, so we incorporated the principles behind Fork.ly's recent "viral launching soon" form. (http://blog.forkly.com/post/2341870004/a-viral-launching-soon-form)
Boy are they smart. The process behind this has given useHipster.com a 0.8 viral rate - basically, for every 10 people who sign up directly, 8 come in through the viral referrals.
I've known Brady and Martin since we were together at TechStars Boulder 2007 (them BrightKite, me madKast), and I've always been super impressed with their work. Fork.ly will be huge, and now thanks to their invite process, Hipster has a good chance of that, too.
Thanks Martin and Brady! You guys are geniuses!