What I like about Threadable is that it's both obvious and contrarian. Startup people usually turn their noses up at mere email. Not sexy enough. Except, everyone relies on email, and everyone hates their tools for managing it.
Thanks, neilk. People say they hate email, but we see that as an indicator of its utility: "I hate this but use it everyday" sounds like an opportunity for improvement. As Elie Wiesel said, "the opposite of love is not hate, it's indifference."
As I pithily mentioned on Twitter, Email is the once and future king.