ReBoxed - a collaborative inbox organization tool built in 77 hours
reboxed.remail.com
reboxed.remail.com
The point is that this is just the start. Even if you don't add new features after the first two days you need weeks or months more to make this product rock solid, with a good UI, seriously scalable, documented, easy to use for the newcomer, and so on.
To get started fast is an invaluable thing, it helps building a lot of things in your life so you simply trow away what appears useless, not working as expected and so on. But to do great things a lot of work is needed anyway.
If I rate emails form Tommy are very important, and Tommy thinks email from Bob are very important, I still don't care to receive email from Bob as important emails and so on. The only useful bit of information that can be extracted from this stuff is that if I really didn't scored Foobar then the importance assigned to Foobar by my friend can be better to start without a clue at all, but anyway in the long run I've to compare Foobar with few of other guys for the system to really know if I care or not about it.
Btw it is a good start. If gmail were a pay-for product I bet that the email system of today would be much, much better. Instead a key component is uninteresting to startups since there are huge companies like Google pushing products that are good enough for most people, for free, and this in some way blocks evolution. It's better to pay 50$/year for a great email system than 0$ for a good one.
also, drop the 77 hours thing. who cares?
Pie-in-the-sky, yes. But this kind of thing makes me think of the possibilities we haven't even begun to explore yet.
While I can totally see you biometrically logging in with your fingerprint or something, I'm having a hard time imagining how I'm going to send an email to that.