I dig the mysterious branding. Although it probably terrible for a mainstream market, I think it will work well with an early adopter crowd.
Ping is another example of a lightweight, notification-driven app. Download the app and "subscribe" to different types of notifications such as popular apps to download, new movies, or even tweets from @kanyewest. I see many similarities to where @orarbel is taking Yo (from what I've gathered). Here's my first ping:
Is this just an experiment, @davidbyttow / @chrysb? Obviously you're busy with Secret so what are the goals here?
Product Hunt
Postmates
Looksy for iMessage
Vibesuite
Alert.email
Postmates
Hovercode