An interesting conceptual email client, that has some good ideas going for it. The design itself is not all that compelling to me, but a few of the ideas behind it are very compelling. Mainly:

– Focusing on readability. Why is this overlooked in current email clients?
– The ability to show all your received attachments seems really neat to me.
– Actions. While I personally would never use them, I know it would improve my life because most everyone I email with would use this feature.

I think the biggest problem with email is that the market is far too niche to be profitable for most companies. While most users could and should have a better email client, not many would be willing to pay for one. I really do hope we see more people working on email clients though and I hope they can make money at it.