I like that it seems to focus a lot on usability, ie giving people what they need most. I only wonder about the quote from the article: "a huge number of people who feel overwhelmed and frustrated by an ever expanding inbox". If that is the case, I wonder if technology is the right approach to solve it. Maybe if the Inbox is overflowing, something else is going wrong (messed up processes etc.). Especially if it is a trend that continues, even with tools like Xobni the information processing capabilities of the human brain can only scale so much.